Back in
1998, a little-known climate scientist named Michael Mann and two colleagues published a paper [PDF] that sought to reconstruct the planet’s past temperatures going back half a millennium before the era of thermometers — thereby showing just how out of whack recent warming has been. The finding: Recent Northern Hemisphere temperatures had been “warmer than any other year since (at least) AD 1400.” The graph depicting this result looked rather like a hockey stick: After a long period of relatively minor temperature variations (the “shaft”), it showed a sharp mercury upswing during the last century or so (“the blade”).
The report moved quickly through climate science circles. Mann and a colleague soon
lengthened the shaft [PDF] of the hockey stick back to the year 1000 AD — and then, in 2001, the U.N.’s Intergovernmental Panel on Climate Change
prominently featured the hockey stick in its Third Assessment Report. Based on this evidence, the IPCC proclaimed that “the increase in temperature in the 20th century is likely to have been the largest of any century during the past 1,000 years.”
And then all hell broke loose.

IPCC Third Assessment Report / WikipediaClick to embiggen.
The hockey stick was repeatedly attacked, and so was Mann himself. Congress got involved, with
demands for Mann’s data and other information, including a computer code used in his research. Then the National Academy of Sciences
weighed in in 2006, vindicating the hockey stick as good science and noting:
The basic conclusion of Mann et al. (1998, 1999) was that the late 20th century warmth in the Northern Hemisphere was unprecedented during at least the last 1,000 years. This conclusion has subsequently been supported by an array of evidence that includes both additional large-scale surface temperature reconstructions and pronounced changes in a variety of local proxy indicators, such as melting on ice caps and the retreat of glaciers around the world.

Susie CagleJoin Grist as we explore how and why our world is warming.
It didn’t change the minds of the deniers, though — and soon Mann and his colleagues were drawn into the 2009 “
Climategate” pseudo-scandal, which purported to reveal internal emails that (among other things)
seemingly undermined the hockey stick. Only, they didn’t.
In the meantime, those wacky scientists kept doing what they do best — finding out what’s true. As Mann relates, over the years other researchers were able to test his work using “more extensive data sets, and more sophisticated methods. And the bottom line conclusion doesn’t change.” Thus the single hockey stick gradually became what Mann calls a “hockey team.” “If you look at all the different groups, there are literally about two dozen” hockey sticks now, he says.
Mother Jones’ Jaeah Lee traced the strange evolution of the hockey stick story in this video:
Indeed, two just-published studies support the hockey stick more powerfully than ever. One,
just out in Nature Geoscience, featuring more than 80 authors, showed with extensive global data on past temperatures that the hockey stick’s shaft seems to extend back reliably for at least 1,400 years.
Recently in Science, meanwhile, Shaun Marcott of Oregon State University and his colleagues extended the original hockey stick shaft back
11,000 years. “There’s now at least tentative evidence that the warming is unprecedented over the entire period of the Holocene, the entire period since the last ice age,” says Mann.
So what does it all mean? Well, here’s the millennial-scale irony: Climate deniers threw everything they had at the hockey stick. They focused immense resources on what they thought was the Achilles’ heel of global warming research — and even then, they couldn’t hobble it. (Though they certainly sowed plenty of doubt in the mind of the public.)
What’s more, even if they’d succeeded, in a scientific sense it wouldn’t have even mattered.
“Climate deniers like to make it seem like the entire weight of evidence for climate change rests on the hockey stick,” explains Mann. “And that’s not the case. We could get rid of all these reconstructions, and we could still know that climate change is a threat, and that we’re causing it.” The basic case for global warming caused by humans rests on basic physics — and basic thermometer readings from around the globe. The hockey stick, in contrast, is the result of a field of research called
paleoclimatology (the study of past climates) that, while fascinating, only provides one thread of evidence among many for what we’re doing to the planet.

Center for American ProgressClick to embiggen.
Meanwhile, the hockey stick’s blade doesn’t just stop rising of its own accord. It’s just going to go up, and up, and up, as the image above, combining the Marcott hockey stick with projections of where temperatures are headed by 2100, plainly shows.
When he shows that graph to audiences, says Mann, “I often hear an audible gasp.” In this sense, the hockey stick does indeed matter — for it dramatizes just how much human irresponsibility, in a relatively short period of time, can devastate the only home we have.
Chris Mooney is host of the
Point of Inquiry podcast and the author of four books, including
The Republican War on Science and
The Republican Brain: The Science of Why They Deny Science and Reality.
About 100 Percent Renewables (via Rosana Francescato, The Energy Collective)
"Negative media coverage has a lot of people thinking solar and other renewable energy sources are not yet ready for prime time. But nothing could be farther from the truth.
In fact, we have the technology to get 100% of our energy from renewable sources. So what’s stopping us, and how do we get to 100% renewables? That question is being answered everywhere I look these days.
A recent study claims that by 2030, we could power a large electrical grid with renewable energy 99% of the time -- without spending more than we do on electricity today. The key, given the intermittency of wind and solar, is to generate power in a distributed manner. But why stop at 99%? We have many tools at our disposal, including demand response programs, to get to 100%.
Local energy advocate Greg Pahl provides detailed ideas and case studies in his book Power from the People. He suggests generating a mixture of renewables in addition to wind and solar, including hydropower, biogas, biomass, liquid biofuels, and geothermal energy. Which sources are used should depend on what’s most readily available and easy to implement in each community. All these plans deal with the issue of intermittency and reduce the need for expensive storage. Even where storage is needed, we can expect technological advances to make it more affordable and effective.
These are all great ideas, but what’s really exciting is that we’re no longer in the idea phase. A number of cities, countries, and businesses have started on the path to 100% renewables. Corporations, schools, and even the Department of Defense are jumping on the solar bandwagon, with some businesses committing to using 100% renewable technologies. The French think tank negaWatt claims that France, known for its dependence on heavily subsidized nuclear power, can get close to 100% renewables by 2050. And other cities and countries are more ambitious. Now an impressive list of regions are either well on their way to generating 100% renewable energy, or are already there."
The Road to 100% Renewables
Tuesday, May 7, 2013 from 5:30 PM to 9:00 PM (PDT)
San Diego, CA
How does San Diego rapidly get to 100 % renewable energy utilization, and what best practices can we learn from
Germany and other global solar leaders? How can you succeed in creating and advancing on a Green career path?
On May 7th, 5:30PM, Join New San Diego Green Leaders including San Diego Mayor Bob Filner, Supervisor Dave Roberts, San Diego Unified School Board Vice President Kevin Beiser, Special Guest Peter Vogel, Executive Vice President, Wirsol Solar, Canada, and Green Careers Recruiter/Branch Manager Scott Gayes, Adecco San Diego. Moderator: Prof. Kathleen Connell, Founder of Green Experts Academy.
This affordable discovery and networking forum includes complimentary Cinco de Mayo foods, beverages, free parking and event materials. Hosted at Cricket Communications, Inc. in their LEED-certified corporate headquarters, 5887 Copley Drive, San Diego, 92111. Our Media Partner is East County Magazine. Register now and reserve your seat! Ticket,including reg fee: $22.09 http://sdgreenleaders.eventbrite.com
About The German Solar Model: Did You Know? -- A new study from the Lawrence Berkeley National Laboratory (LBNL) puts some hard numbers to the benefits realized when U.S. cities streamline their solar PV permitting processes. Germany's residential solar adoption is attributed to friendly policies and incentives, but also friendly permitting processes. Meanwhile, in the U.S., "soft" costs amount for more than half of the installed price for residential solar PV systems in the US. Various studies have pointed out the results: Customer acquisition costs are ten times higher in the U.S. vs. Germany, $0.67 vs. $0.06, and "overhead" adds up to $1.24/W, or $5,000 for the average system (Solar Freedom Now) $0.22/W on average for permitting + inspection + interconnection, including $0.09/W in fees (NREL) Local permitting and inspection adds $0.50/W, or $2,500 per residential install, and nearly a month of delays (SunRun) Labor costs alone add $0.11/W, and eight weeks average permitting time (Clean Power Finance)
Below is an example letter to CA Assembly Speaker Perez, in support of AB 1014 (2013) which will make Solar Renewable Energy available to people who do not own a home, but pay property taxes and utility bills in California. Please read, copy, and send this letter to your representatives. Here is a link to make it easy: Vote Solar
----------------------------------------
Dear Assembly Speaker Perez,
As a renter, who owns no real-property, in the state of CA, but still pays property taxes indirectly via my lease, and uses energy, and pays utility bills, I want a choice. I write to express my strong support for passing AB 1014, the Shared Renewable Energy Self-Generation Program. AB 1014 expands consumer access to renewable energy, providing all customers of SCE, SDG&E and PG&E with the opportunity to invest in an offsite renewable energy system and receive a utlity bill credit in return.
It extends the economic benefits of renewable energy to the large percentage of Californians who currently have no access: renters, people whose homes or businesses are shaded or poorly oriented, space limited public entities, and consumers who lack sufficient credit. It also ensures new clean energy over and above what is required by the state's other clean energy programs.
I support shared renewables as a way to expand the availability of renewable energy to thousands more Californians.
Please support AB 1014.
The traditional panels-on-your-roof solar model has already made California a big solar success story, but it simply doesn’t work for those who don’t own a suitable roof — say, those who rent their homes or office space, or a school with shaded roofs. A new model, called shared solar, allows these energy customers to instead subscribe to an offsite solar project and get credit on their utility bills for clean power produced. That's going to unlock enormous new investment in clean energy across the state.
To make this common sense idea a reality in California, Vote Solar and many allies are working to pass legislation in Sacramento - SB 43 and AB 1014 - to create a pilot program that would result in additional clean energy over and above what’s required under the state’s other clean energy programs.
But we're facing opposition from some utilities, since a big shared solar program would allow more of their customers to opt out of buying power from their polluting power plants. That's why we need your help!
In just a few days, both bills come up for a critical vote in their Energy committees. Take action now to tell your State Representatives to pass shared renewables legislation and open the doors to even more solar goodness: energy bill savings, local jobs, private investment, cleaner air and healthier communities.
Act now and help us give all Californians the opportunity to choose 100% renewable energy!
Bill Moyers talks to scientist and philosopher Vandana Shiva, who’s become a rock star in the global battle over genetically modified seeds. These seeds — considered “intellectual property” by the big companies who own the patents — are globally marketed to monopolize food production and profits. Opponents challenge the safety of genetically modified seeds, claiming they also harm the environment, are more costly, and leave local farmers deep in debt as well as dependent on suppliers. Shiva, who founded a movement in India to promote native seeds, links genetic tinkering to problems in our ecology, economy, and humanity, and sees this as the latest battleground in the war on Planet Earth.
There is a revolution brewing in the hearts and minds of the world's women.
Seed Future is an example of success agains the corporations which seek to take over our global resources.
Normally, when we consider the impact of climate change, we think primarily about the environment -- the melting Arctic ice cap or Greenland ice shield, rising global sea levels, intensifying storms, expanding deserts, and endangered or disappearing species like the polar bear. But a growing number of experts are coming to realize that the most potent effects of climate change will be experienced by humans directly through the impairment or wholesale destruction of habitats upon which we rely for food production, industrial activities, or simply to live. Essentially, climate change will wreak its havoc on us by constraining our access to the basics of life: vital resources that include food, water, land, and energy. This will be devastating to human life, even as it significantly increases the danger of resource conflicts of all sorts erupting.