-Source-CNBC- Jeremy Grantham the longtime investor famous for calling the last two major bubbles in the market is urging capitalists and mainstream economists to recognize the looming threat of climate change. Capitalism and mainstream economics simply cannot deal with these problems. Mainstream economics largely ignore them Grantham who co-founded GMO in 1977 said Tuesday in an impassioned speech at the Morningstar Investment Conference in Chicago. We deforest the land we degrade our soils we pollute and overuse our water and we treat air like an open sewer and we do it all off the balance sheet. This negligence is due in large part to how short-sighted corporations can be Grantham said. Anything that happens to a corporation over 25 years out doesnt exist for them therefore as I like to say grandchildren have no value to them he said. Grantham has been outspoken about his concerns over climate change for years. In 1997 he started the Grantham Foundation for the Protection of the Environment which gives money to entities that look to protect the environment. Granthams company also launched the GMO Climate Change fund last year which invests in wind and solar companies.