If CO₂ Were Not Present in the Atmosphere,the Average Temperature $\circ$

Q24: Likely global climate changes in the 21^st

Q25: The atmosphere of Venus is thought to

Q26: The level of oxygen in the form

Q27: Biologic use of CO₂ has lessened the

Q28: The Earth is _ during the Northern

Q30: The CO₂ from the early Earth's atmosphere

Q31: A major release of methane hydrate,which is

Q32: Observed effects of global warming in recent

Q33: Shells constructed from seawater incorporate the O¹⁸/O¹⁶

Q34: Water has such a tremendous capacity to