The quest for renewable energy sources is on and you've probably heard about the major players: solar, wind, hydrogen, ethanol. But who is writing about some other innovative sources you may not know about?

Areas around the world including Australia, the United Kingdom, Paris, San Francisco, Bangladesh, South Africa, Shanghai and Taiwan are addressing the negative environmental impact of plastic bags head-on. Through taxation or outright banning, the bags that pile on the litter, take 1,000 years to decompose and despite being resuable and recyclable, are thrown away to the tune of 100 billion each year in America alone, are being edged out. Some statistics from the U.S. Environmental Protection Agency, which urges consumers to buy reusable bags (I highly recommend reusablebags.com):

The U.S. Green Building Council lists the following environmental benefits of green building. Green building will: Enhance and protect ecosystems and biodiversity Improve air and water quality Reduce solid waste Conserve natural resources Let's find out who's blogging about green buildings.

"The average American uses about 25 gallons of toxic, hazardous chemical products per year in their home [and] a major portion of these can be found in household cleaning products," according to the book "Prosperity Without Pollution: The Prevention Strategy for Industry and Consumers" by Joel S. Hirschhorn and Kirsten U. Oldenburg. How can we get the toxins out of our home? Is it difficult? Let's see what these writers have to say.

"An Inconvenient Truth" was awarded an Oscar for best documentary feature last Sunday. The film addresses global warming and features Al Gore discussing our current "planetary emergency." Here are some writers exploring the film and its issues.