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If and when the day comes that models can predict accurately short-term phenomena and have attained enough confidence in their long-term accuracy to deem them correct, if they show that moderate increases in carbon dioxide levels have major implications on the ecology, then, and only then, will I agree to political action based on the science. Should that day come, I will probably stand on the front line of the battle, developing new ways to power our society safely and new ways to minimalize/reverse any damage.
But that day is not today, and not tomorrow until that evil link between politics and scientific research is severed, dead, and gone from memory.
... Over the twentieth century, anthropogenic forcings cause a warming trend of 0.5 ± 0.15 K /century. The trend due to greenhouse gases is 0.9 ± 0.24 K/century, while the remaining anthropogenic factors cool at a rate of 0.4 ± 0.26 K/century. The uncertainty in the total anthropogenic warming trend is less than the uncertainties in the individual trends, as they are correlated with one another; see below. Over the century, natural forcings contribute little to the observed trend. Our analysis considers only uncertainty in the amplitude of the simulated response and neglects uncertainty in the time dependence of the forcing and in the spatial patterns of response, as well as neglecting uncertainties in the observations. However, our best estimates are consistent with the observations. Furthermore, in a single ensemble of simulations forced with both natural and anthropogenic forcings, changes in simulated near-surface temperature are consistent with those observed [Stott et al., 2000], suggesting that those uncertainties may not be too great.
During the first half of the century, greenhouse gases and natural forcings cause warming trends of 0.2 –0.3 K/ century, while other anthropogenic factors produce negligible cooling trends (Figure 10). Over the last half of the century, greenhouse gases warm the climate at a rate of 1.7 ± 0.43 K /century, with natural forcings (largely volcanic aerosol) and other anthropogenic factors (mainly the indirect effect of sulphate aerosols) both causing an estimated cooling trend of 0.3 ± 0.2 K/century. Thus, since 1947, changes in aerosol concentrations (anthropogenic and natural) have offset about a third of the greenhouse gas warming.
There are simply some things which should never, ever be mixed. Politics and religion, politics and military, religion and science, and especially politics and science. The results have never been positive.
However, carbon dioxide fertilization isn’t the only cause of increased plant growth—nitrogen, land cover change and climate change by way of global temperature, precipitation and sunlight changes all contribute to the greening effect.
While rising carbon dioxide concentrations in the air can be beneficial for plants, it is also the chief culprit of climate change. The gas, which traps heat in Earth’s atmosphere, has been increasing since the industrial age due to the burning of oil, gas, coal and wood for energy and is continuing to reach concentrations not seen in at least 500,000 years. The impacts of climate change include global warming, rising sea levels, melting glaciers and sea ice as well as more severe weather events.
The beneficial impacts of carbon dioxide on plants may also be limited, said co-author Dr. Philippe Ciais, associate director of the Laboratory of Climate and Environmental Sciences, Gif-suv-Yvette, France. “Studies have shown that plants acclimatize, or adjust, to rising carbon dioxide concentration and the fertilization effect diminishes over time.”
While the detection of greening is based on data, the attribution to various drivers is based on models