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Research into the best business consultants on climate change issues reveals that the bigger the consultancy, the better value for money you get. A report by Verdantix, a British consultancy, concludes that of 16 major league consultants, IFC International scored best.

The number of "microborrowers" worldwide-people participating in the rapidly growing field of microfinance-increased by 17 percent in 2006, benefiting both communities and the environment, according to the latest Vital Signs Update released by the Worldwatch Institute.

One reader worried that many sunscreens rely on nanotechnology, which manipulates particles that are smaller than 100 nanometers (nm); for comparison, a human hair is about 80,000 nm in diameter. Some research indicates that nanoparticles of titanium dioxide, which makes it easier for sun screen to soak into the skin, are small enough to bypass the body's defensive "blood-brain barrier," enter the brain and damage brain cells.

The world's wetlands, threatened by development, dehydration and climate change, could release a planet-warming "carbon bomb" if they are destroyed, ecological scientists said on Sunday. Wetlands contain 771 billion tons of greenhouse gases, one-fifth of all the carbon on Earth and about the same amount of carbon as is now in the atmosphere, the scientists said before an international conference linking wetlands and global warming.

Solar power means more than solar panels. These days it can also mean collectors, towers, dyes, oh my! Here’s a guide to (most of) the different kinds of solar technologies that are out there today. First, the basics: Anything that uses solar energy as a source of power is solar-powered. Simple, right? Well let’s not forget that the sun gives us more than a whole spectrum of light, it also gives us heat. Both are used for a wide variety of applications, not just electricity.

A chief obstacle to the true greening of the meetings industry is air travel. According to USA Today, on a New York-to-Denver flight, a commercial generates 840 to 1,660 pounds of carbon dioxide per passenger — what a typical driver generates with an SUV in a month. Now, imagine the carbon footprint of 10,000 attendees flying into a Denver convention — even one planned with the intention of being Earth-friendly.

A chemical tanker split a fuel barge in half on the Mississippi River on Wednesday, spilling thousands of gallons of fuel oil and forcing the closure of a 58-mile (93-km) stretch from New Orleans southward that could last for days, a U.S. Coast Guard spokesman said.

India's top firms face little stakeholder pressure to combat climate change with only about 40 percent of the companies surveyed setting voluntary carbon emissions reduction goals, a report said. A survey by KPMG consultants of 70 CEOs found their response to climate issues was driven largely by the need to comply with expected regulations, while leaving the leadership role in tackling global warming to the government.

A young whale pokes its melon-shaped head into the cool morning air near this remote island, a sign its herd is thriving despite mounting threats in Russia's melting Arctic. Cameras and microphones capture the whale's every move as scientists use the species only shore-side breeding ground to see how they are coping as fleets of oil tankers replace melting ice in their traditional feeding grounds.

California, six other Western states and four Canadian provinces launched plans on Wednesday for one of the world's largest carbon-trading systems, a sweeping effort to cut greenhouse gas emissions that contribute to global warming.