Thousands of scientists plan March for Science on Earth Day

Tens of thousands of scientists plan to mark Earth Day on Saturday by marching in hundreds of cities across the country and around the world. They’ll be protesting cuts to research and programs aimed at fighting climate change.The march comes as many Americans are pessimistic about the environment. A CBS News poll on Friday found just 12 percent believe the environment will improve for the next generation. Fifty-seven percent say it will get worse.Ahead of Earth Day, most Americans pessimi