Analysis Of James Hansen 's ' The Cold Warming '

877 WordsNov 21, 20144 Pages
James Hansen found out what objects produced the most Carbon dioxide and why there was an increase in the amount used. The results showed that CO2 represented 50% of the fossil fuels emitted. The results also showed that the growth rate of CO2 doubled between the 1950’s and the 1970’s, but leveled out from the late 1970’s until the late 1990’s. (Ed Dlugokencky and Tom Conway) The graph shows which item released the most carbon in our atmosphere and coal was the leading producer up until about 1965 when people started using more oil. The increase in CO2 in our atmosphere represents about half of the emissions from fossil fuels and changes in tropical land use. Forest clearing and other biomass burning also emit a decent amount of CO2. They…show more content…
The models that focuses on increasing greenhouse gases and stratospheric ozone changes, mimicked the actual weather changes which have occurred in the last two to three decades. This suggests the computer models for the distant future will also be true (Schindell). The models show the gases will decrease at the polar cap but increase in the middle latitude areas. Also temperatures are shown to cool in the Antarctic region and warm in the middle latitudes including the southern tip of South America (Schindell). Figure 1 shows two aspects of the results. The left side displays the information about the amount of greenhouse gases and ozone changes in “500 hPa geopotential height trends (m) are for 1979–2000” (Schindell). The top left shows the computer model predictions while the bottom left shows what existed during the 1979-2000 time frame. The right side of figure 1 shows the “surface air temperature trends (C) are for 1969–2000” (Schindell). Both of these images show the temperatures in the arctic regions are cool and the middle latitude regions are warmer. This is an effect of the changes occurring with the greenhouse and ozone gases. Table 1 500 hPa Heights (m/yr) 1970–1999 2000–2050 • Observations −1.54 ± 0.96 Ozone depletion (O3) −1.26 ± 0.54 0.51 ± 0.22 Greenhouse gases (GHG) −0.38 ± 0.29 −0.51 ± 0.14 O3+GHG −1.19 ± 0.33 −0.13 ± 0.16 Sea Level Pressure (hPa; 1958–2000) 40°S 65°S 40°S–65°S Observations 0.9
Open Document