By CATHY BUSSEWITZ
AP Energy Writer
NEW YORK (AP) — The federal government is investing in machines that suck giant amounts of carbon dioxide out of the air in the hopes of reducing damage from climate change. The Department of Energy says it will release $3.5 billion to groups developing direct air capture and other technologies that remove carbon dioxide, which when released into the atmosphere causes global warming. Climate scientists say humans have already allowed too much carbon dioxide into the atmosphere to prevent dangerous rises in global temperatures. They say on top of curbing emissions we must also remove carbon dioxide from the air that’s already been released.