Google is secretive about its energy consumption and carbon footprint. It also refuses to divulge the locations of its data centres. However, with more than 200m internet searches estimated globally daily, the electricity consumption and greenhouse gas emissions caused by computers and the internet is provoking concern. A recent report by Gartner, the industry analysts, said the global IT industry generated as much greenhouse gas as the world’s airlines - about 2% of global CO2 emissions.

Google is secretive about its energy consumption and carbon footprint. It also refuses to divulge the locations of its data centres. However, with more than 200m internet searches estimated globally daily, the electricity consumption and greenhouse gas emissions caused by computers and the internet is provoking concern. A recent report by Gartner, the industry analysts, said the global IT industry generated as much greenhouse gas as the world’s airlines - about 2% of global CO2 emissions.

Sam Goldman and Ned Tozun are hard at work figuring out how to bring light to the more than 1.5 billion in this world without it.

In 2006, Sam, now the CEO, and Ned, the President, founded D.light Design (www.dlightdesign.com) with the assistance of classmates in an entrepreneurship class at Stanford’s Graduate School of Business.

Diesels are fuel efficient and practical, but they're dogged by a reputation for being about as much fun as a tax audit. VW's worked hard to change that perception with cars like the Jetta TDI, but it might be the sweet Concept BlueSport roadster that finally convinces Americans diesels are cool.

One of the world's top climate scientists has written a personal new year appeal to Barack and Michelle Obama, warning of the "profound disconnect" between public policy on climate change and the magnitude of the problem.

For those who haven’t heard of it, the Aptera 2e is the first vehicle from Aptera Motors, a Carlsbad startup with funding from Idealab, Google, and other sources.(Also for those who hadn’t heard of it: it’ll look great in your cave.)

Dear EarthTalk: This winter is shaping up to be one of the coldest in recent memory where I live. What can I do to reduce my home heating bill now and in the future? - Eric Lenz, Seattle, WA