Dear EarthTalk: What’s the deal nowadays with aerosol spray cans? I thought that the ozone-depleting chemicals used in them were eliminated back in the 1970s. Is this true? If so, what is now used as a propellant? Are aerosols still bad for the ozone layer?

Dear EarthTalk: What's the story with LED light bulbs that are reputed to be even more energy-efficient than compact fluorescents?

I’ve been reading your column in Spirit of Change. My situation is somewhat unique, but applicable to many people who must live in rented space.

Eliminate Junk Mail: Cancel unwanted catalogs and cancel most unwanted credit card offers.

This is in response to your fall ’08 editorial entitled "Musings." You’ve expressed a bright vision of our world, which builds on our society’s experiences of just a few generations ago.

Dear EarthTalk: The 2008 Summer Olympics in China drew a lot of attention for political reasons. One ray of light is China's effort to make the event as green as possible.

Dear EarthTalk: What’s available now in lawnmowers that are easier on the environment?

Dear EarthTalk: I’ve heard that there are plans to build a large repository for nuclear waste in Yucca Mountain in Nevada, but that plans have been slow and are very controversial.

David Bearg feels he's been blessed and cursed to be anti-delusional in a delusional culture.

Here’s 25 simple ways you can start using green technology today to lighten your energy load on the planet.

The world’s cities are facing unprecedented problems. In Mexico City, Tehran, Kolkata, Bangkok, Shanghai, and hundreds of other cities, the air is no longer safe to breathe.

Situated on a tall sea cliff above pounding waves, the Diablo Canyon nuclear power plant enjoys the kind of stunning ocean view typical of Central California's rugged coast.

During the Great Depression, the Works Project Administration (WPA) launched a remarkable public education campaign tapping the nation’s unemployed artists to create art deco posters promoting safety, good health, conservation of natural resources, community involvement and other American values.

Dear EarthTalk: What is the "cleantech" business sector and why have I been hearing that term so much lately?

Dear EarthTalk: What are some of the best online sources of environmental information?

Dear EarthTalk: It is true that the carcasses of whales that wash up on shore are considered danger­ous to humans because of the amount of toxins and chemi­cals in their blubber?

I read in your last column that the left rear quadrant of my property represents my wealth sector and that I should avoid placing metal there...

Each year as we travel to China to explore its many wonders, one cannot help but notice changes that are going on around the country. Some are good and some are bad.

Carbon offsets are monies that consumers and businesses pay voluntarily to compensate for the greenhouse gas emissions they generate directly by driving, flying, running the air conditioning and otherwise using non-renewable energy.

Participating in an environmental club is an excellent way for high school students to learn about environmental issues while providing measurable benefit to their community.

Analysts at the nonprofit Earth Policy Institute (EPI) estimate that the United States could close 80 coal-fired power plants if Americans switched over en masse to compact fluorescent light bulbs (CFLs).

With just about every company trying to green its products, services and internal operations these days, there has never been a better time to find a green job.

“In late summer 2007, reports of ice melting were coming at a frenetic pace. Experts were “stunned” when an area of Arctic sea ice almost twice the size of Britain disappeared in a single week,” writes Lester R. Brown in his new book, Plan B 3.0: Mobilizing to Save Civilization (W.W. Norton & Company).

A new age in garden practices is blooming including organic gardening and bringing heirloom varieties of seeds back into home gardens.