Question

Which one of the following is true regarding models of global climate change during the 21st century?

a. The various models show close agreement on trends and on 2100 estimates for projected carbon dioxide levels, sea levels, and global temperatures among regions.
b. The various models show no agreement at all in trends of predicted sea levels and mean global temperatures.
c. The various models show close agreement on regional trends for projected carbon dioxide levels, sea levels, and temperatures.
d. The various models show general agreement on global trends for projected carbon dioxide levels, sea levels, and temperatures.

Answer 1

The various climate change models generally agree on global trends, predicting increased atmospheric CO2 levels, rising sea levels, and higher global temperatures, though specifics may vary regionally.

Step-by-step explanation:

Climate change models often differ in their specific projections regarding the extent of changes, but they typically concur that increasing levels of carbon dioxide in the atmosphere from the burning of fossil fuels are resulting in a warming effect on Earth's climate, with varying regional impacts.

These models predict a continued rise in global temperatures, with a potential increase of 0.3-4.8 degrees C. The warming is expected to be more significant over land and in the Arctic regions. Regarding sea levels, models agree on a global trend of rising sea levels, but the rate and the regional differences can vary based on numerous factors. They project this rise due to the thermal expansion of oceans, melting of ice caps, and loss of ice from Greenland and Antarctic sheets. Despite differing details and ranges, a consensus is seen in the projection of these key indicators of climate change.