Past Climate Data Measured with Instruments Extends Back About

Q26: Which of these is the most important

Q27: Proxy data:<br>A)provide climate data representing times when

Q27: The tilt of the earth's axis varies

Q28: Measured variations in the Sun's emission of

Q29: Global warming could lead to a shorter

Q30: The best way to estimate the cooling

Q33: Although the carbon dioxide content of our

Q35: Requirements for an ice age on Earth

Q36: CO₂ concentrations today are not any higher

Q82: One possible result of the addition of