By Setiowati
XII Bahasa
Global
Warming
The intergovernmental panel on climate change (IPCC) concludes that most
of the observed temperature increase since the middle of the 20th
century was caused by increasing concentrations of greenhouse gases resulting
from human activity such as fossil fuel burning and deforestation. The
intergovernmental panel on climate change also concludes that variations in
natural phenomena such as solar radiation and volcanoes produced most of the
warming from pre-industrial times go 1950 and had a small cooling effect
afterward. These basic conclusions have been endorsed by more than 40
scientific societies and academies of science. Including all of the national
academies of science of the major industrialized countries.
Climate model projections summarized in the latest IPCC report indicate
that the global surface temperature will probably rise a further 1.1 to 6.4˚C
(2.0 to 11.5˚F) during the twenty – first century. The uncertainty in this
estimate arises from the use of models
with differing sensitivity to greenhouse gas concentrations and the use of
differing estimates of future greenhouse gas emissions. Some other
uncertainties include how warming and related changes will vary from region
aroud the globe.
