So that was a heck of a rally. I welcome readers who attended to share their thoughts and pics.

If you missed it, you can get details from USA Today‘s story “Tens of thousands demand action on climate change.” Or from the Sierra Club news release, “More Than 35,000 Strong March on Washington for Climate Action.”

And then there’s always the Climate Progress twitter feed — my first mass tweeting from an iPhone.

I loved the combination of passion and knowledge that was driving the day. I had the chance to talk to a bunch of the speakers and was impressed by the strength of their commitment on climate in general and Keystone XL in particular.

Van Jones made clear that all of President Obama’s other accomplishments would be wiped away if he approves Keystone, since future generations are going to judge all of us on the basis of the actions we take on climate.

I was very impressed with the celebrities who came, that they had substance to go with the style. How great to have Rosario Dawson explain that it is called “tar sands” and not “oil sands.” And in chatting with her afterwards, it’s clear she also understands the spectrum of clean energy solutions.

And Evangeline Lilly (aka Kate Austen from Lost) was there as a Canadian to apologize to all the Americans in the audience for her country’s ceaseless efforts to send the dirtiest of fuels our way. I have seen every episode of Lost but lost my nerve to tell her how much I enjoyed her show except for the last five minutes, that is. It’s not like she was one of the writers…. But I digress.

I had a long talk with Tom Steyer, the billionaire hedge-fund manager who helped lead the “No on Prop 23″ campaign to save California’s climate law in 2010. He is also on the board of CAP. He is full throttle that we have to act — and act now — if we are to avert catastrophe. He said to the crowd that he has spent a lot of time reviewing investments and Keystone is a bad investment for this country.

It is good to see a movement with passion from the top all the way down to the roots.

Future cost drops from Chinese crystalline silicon solar producers will not be as steep as recent years, but they will still be significant.

Stephen Lacey, via GreenTechMedia

The cost of producing a conventional crystalline silicon (c-si) solar panel continues to drop. Between 2009 and 2012, leading “best-in-class” Chinese c-Si solar manufacturers reduced module costs by more than 50 percent. And in the next three years, those players — companies like Jinko, Yingli, Trina and Renesola — are on a path to lower costs by another 30 percent.

Check out [the above] chart outlining projected costs, which comes from GTM Research’s Global Intelligence PV Tracker.

“Clearly, the magnitude of cost reductions will be less than in previous years. But we still do see potential for significant cost reductions. Going from 53 cents to 42 cents is noteworthy,” says Shayle Kann, vice president of research at GTM Research.

With plenty of innovation still occurring in crystalline silicon PV manufacturing — including new sawing techniques, thinner wafers, conductive adhesives, and frameless modules — companies are able to squeeze more pennies off the cost of each panel. However, as the chart above shows, innovating “outside the module” to reduce the installed cost of solar will be increasingly important as companies find it harder to realize cost reductions in manufacturing.

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• In Australia, Wind Power Is Already Cheaper Than Fossil Fuels, And Solar Is Right Behind

University of Adelaide news release

A worldwide review of global rainfall data led by the University of Adelaide has found that the intensity of the most extreme rainfall events is increasing across the globe as temperatures rise.

In the most comprehensive review of changes to extreme rainfall ever undertaken, researchers evaluated the association between extreme rainfall and atmospheric temperatures at more than 8000 weather gauging stations around the world.

Lead author Dr Seth Westra said, “The results are that rainfall extremes are increasing on average globally. They show that there is a 7% increase in extreme rainfall intensity for every degree increase in global atmospheric temperature.

“Assuming an increase in global average temperature by 3 to 5 degrees Celsius by the end of the 21st century, this could mean very substantial increases in rainfall intensity as a result of climate change.”

Dr Westra, a Senior Lecturer with the University of Adelaide’s School of Civil, Environmental and Mining Engineering” and member of the Environment Institute, said trends in rainfall extremes were examined over the period from 1900 to 2009 to determine whether they were becoming more intense or occurring more frequently.

“The results show that rainfall extremes were increasing over this period, and appear to be linked to the increase in global temperature of nearly a degree which also took place over this time.

“If extreme rainfall events continue to intensify, we can expect to see floods occurring more frequently around the world,” Dr Westra said.

The strongest increases occurred in the tropical countries, although some level of increase seems to be taking place at the majority of weather gauging stations.

Dr Westra said, “Most of these tropical countries are very poor and thus not well placed to adapt to the increased risk of flooding, which puts them in a larger threat of devastation.”

This work is being published in the Journal of Climate and can be seen online.

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