Why are there different theories about the effects of global warming?
a. there is no data to support global warming.
b. global climate is complex, so changes in global climate are hard to predict.
c. increased levels of carbon dioxide are offset by other changes.
d. there has been a decrease of extreme weather.

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This phrase from the declaration of independence and its primary author thomas jefferson can be used to justify which statement? a) jefferson thought this document could be used in his defense were he put on trial for treason. b) jefferson knew that the colonists' actions would have an international impact. c) jefferson believed that a bill of rights was necessary in the new government. d) jefferson was trying to show the king that the colonists were intellectuals.