Chris Field : U.S. urgently needs to heed Obama 's Climate Action Plan . He says we 've been pumping massive amounts of CO2 into atmosphere since 1800s . He says our buildings , cars , power plants commit us to to a path that needs to change . Field : We're not going to stop until the planet is safe for humans and animals alike.
Chris Field : U.S. urgently needs to heed Obama 's Climate Action Plan . He says we 've been pumping massive amounts of CO2 into atmosphere since 1800s . He says our buildings , cars , power plants commit us to to a path that needs to change . Field : If we do n't , we face weather extremes , threats to human health .