John Doerr, Silicon Valley's legendary moneyman, is afraid of eco-apocalypse. After building his reputation (and a considerable fortune) investing in high-tech successes, he's turning his focus toward green technologies, and hoping it isn't too late. John Doerr, a partner in famed VC firm Kleiner Perkins Caufield & Byers, made upwards of $1 billion picking dot-com stars like Amazon, Google, Compaq and Netscape. (He also picked some flops, like Go Corporation and the scandal-ridden MyCFO.com.) He was famously quoted saying, "The Internet is the greatest legal creation of wealth in history," right before the dot-com crash. But now he's back, warning that carbon-dioxide-sputtering, gas-powered capitalism will destroy us all, and that going green may be the "biggest economic opportunity of the 21st century." So Kleiner Perkins has invested $200 million in so-called greentech, a combination of startups that are pioneering alternative energy, waste remediation and other schemes to prevent the coming environmental calamity. But Doerr is afraid that it might be too little, too late. "[John Doerr] is, by all accounts, the most influential venture capitalist of his generation." - Fast Company