Strategies against global warming - How can investors and venture capitalists help save the Earth and solve the climate crisis?

Here’s one example: L. John Doerr is an American venture capitalist at Kleiner Perkins Caufield & Byers in Menlo Park, California, in the Silicon Valley. He currently serves on the boards of public companies Google, Amazon, Intuit, Homestore, and Sun. His success in venture capital has garnered national attention; he has been and is currently listed on Forbes Magazine’s exclusive “Midas List” and is widely regarded as one of the top technology venture capitalists in the world. Today, Doerr remains one of Silicon Valley’s most influential figures. Forbes magazine estimates his net worth to be well over $1 billion. Doerr is a high profile supporter of the Democratic Party in Silicon Valley. Through the TechNet (a lobbying organization) he helped found, he has devoted much time and money towards impacting legislation beneficial to the technology and venture capital industries. Doerr has also invested heavily in “carbon trading” and is a big advocate of its use. In a 2007 TED conference he was brought to tears using his daughter’s remarks on “saving the world” urging people to invest in carbon credits as a solution for global warming. (from Wikipedia)

http://en.wikipedia.org/wiki/John_Doerr

Are there other examples? What else could investors do? Buy only shares of companies seriously committed to sustainable development? What are your thoughts?