Recent Climate Change - Temperature Changes | Science | Climate Change | U.S. EPA Records from land stations and ships indicate that the global mean surface temperature warmed by about 0.9°F since 1880 (see Figure 1). These records indicate a near level trend in temperatures from 1880 to about 1910, a rise to 1945, a slight decline to about 1975, and a rise to present (NRC, 2006). The Intergovernmental Panel on Climate Change (IPCC) concluded in 2007 that warming of the climate system is now unequivocal, based on observations of increases in global average air and ocean temperatures, widespread melting of snow and ice, and rising global average sea level (IPCC, 2007). Even more important than the numbers, are the effects of the rise. That rise in uneven, actually cooling in some places, and rising rapidly, like Alaska, indeed, the whole Arctic, in others. At present, we are seeing the North Polar Ice Cap rapidly decreasing both in volume and extant. https://www.e-education.psu.edu/meteo469/node/130 Another effect is the movement of climatic zones. What Might Man-Induced Climate Change Mean? | Foreign Affairs The whole point is that we are presently engaged in a worldwide experiment in which we will have to live with the results for many generations. With no real idea of how much change we are creating. A point of fact, we have not seen the present level of CO2 in the atmosphere for at least 15 million years. Nor the present level of Ch4 for at least that long, maybe a good deal longer.