As they reach the age of the 1970 Earth Day protesters, they'll start to run businesses, seek positions in government and make decisions that will shape the country's environmental and economic future, he said.
"There is reason to hope that having grown up with some of the benefits of these first decades of environmental progress, that they will take things to the next level," he said.
Stewart Brand, the founder of "The Whole Earth Catalogue," who urged NASA to publish the first satellite images of Earth, said that though environmentalists and the general public may not always agree on how to take on the next 40 years of environmental problems, they'll have to remember that at the climate level, everything is convergent.
"We're all in this together," he said. "Climate happens to everybody and the changes that we don't like are being caused by everyone."