Are our crops less nutritional because of global warming?

Dear EarthTalk: Is it true that global warming is causing our crops to be less nutritious?

William Persson

Glendale, Ohio

Should we be eating genetically engineered food?

Dear EarthTalk: What are the potential health and environmental impacts of so many genetically engineered organisms in our food supply?

Frank C.

Charlottesville, Va.

Tar sands, birds don’t mix

Dear EarthTalk: How is it that migrating birds are being negatively affected by oil extraction in Canada’s Boreal forest?

Jennifer Chase

Fort Lauderdale, Fla.

Obesogens are explained

Dear EarthTalk: I’ve heard that, above and beyond our bad eating and lifestyle habits, some chemicals in everyday products are contributing to the obesity problem. Can you explain?

Alyssa Israel

Fairfield, Conn.

Obesity is a huge problem in the U.S. and other industrialized countries. According to the U.S. Centers for Disease Control and Prevention, obesity rates have doubled for American adults and tripled for kids and teenagers ages 6 through 19 since 1980. Today, 31 percent of American adults and 15 percent of youngsters are classified as overweight.

Is BPA a health risk?

Dear EarthTalk: A recent study showed that Bisphenol A (BPA) was hardly the human health risk researchers once believed it to be. Should I still try to avoid products that may contain it?

Carolyn Danes

Waukesha, Wis.


Are there obvious ways we could improve food safety?

Dear EarthTalk: What would you consider to be the key areas we need to improve to make our food safer for our health and easier on our environment?

Billy A.

Oakland, Calif.


Abandoned factories and the pollutants left behind

Dear EarthTalk: What are “ghost factories?”

Philip Walker

Hartford, Conn.


What’s blowing in the wind?

Dear EarthTalk: What is the latest prognosis for wind energy to command a larger piece of the renewable energy pie?

Peter M.

Akron, Ohio


The Earth Day theme in 2013 is climate change


Dear EarthTalk: What is the theme of this year’s Earth Day festivities?

J. Worden

Austin, Texas


What is National Wildlife Week in March all about?

Dear EarthTalk: What is the purpose of National Wildlife Week, which I understand will take place in March 2013?

Melissa P.

Burlington, N.J.

National Wildlife Week is a program of the non-profit National Wildlife Federation (NWF) that is designed around teaching and connecting kids to the wonders of wildlife. Each year, the group picks a theme and provides fun and informative educational materials, curriculum and activities for educators and caregivers to use with their kids.