But We Can look Even back weitere. By drilling the deepest glacial ice Into We Can measure CO2 deep into time. And this ice library shows more carbon dioxide in the atmosphere Than at Any Time in last 650.000 years. As a result of the build up of gases, the temperature is Beginning to rise. Adults Have Already today Felt the global average temperature rise more Than a full degree Fahrenheit (0.8 C) during Our Lifetime. For a global system Delicately balanced That is, the rise in temperatures will pose Serious Threats: Rising is Levels, Leading to more coastal erosion, flooding During storms, and permanent inundation Increaser Increaser Incidence of Drought and wildfires Severe stress on many forests, wetlands, alpine regions, and Other Natural Ecosystems Impacts on human health as mosquitoes and Other disease-carrying insects and rodents spread diseases over larger regions Geographical Disruption of agriculture in Some parts of the world due to increaser temperature, water stress, and sea-level rise in Such low-lying areas as Bangladesh or the Mississippi River delta Increaser Other Projected Impacts include intensity of hurricanes, the long-term destabilization of the Greenland and ice sheets, Leading to much Great Sea level rise, the acidification of the world's oceans, and a vastly Increaser rate of species extinction.
Such wonders as the Great Barrier Reef and the Amazon Could collapse under the weight of just a FEW more degrees. And hundreds of millions of people May be Forced from Their homelands as the climate shifts, Creating Political and Economic Instability increaser. According To A Study led by a Distinguished British economist Sir Nicholas Stern, Suggests That under business-as-usual scenarios climate change reduces overalls Could Economic Activity in the range of 5 to 20%-more Likely on the high side of this range.