(Corvallis, OR) -- A new study out of Oregon says the Earth appears closer to the risk of a "hothouse" trajectory than previously believed. Climate scientists at Oregon State University, and an international collaboration, say increasing temperatures could cause feedback loops that would cause temperatures to rise more. Tipping elements include ice sheets in Antarctica and Greenland, mountain glaciers, sea ice and boreal forests. They say that if action isn't taken quickly, and the hothouse trajectory starts, it'll be much more difficult to reverse.