Scientist: Earth' s average annual temperature has increased by about 0. 5 degrees Celsius over the last century. This warming is primarily the result of the buildup of minor gases in the atmosphere, blocking the outward flow of heat from the planet. Which one of the following, if true, would count as evidence against the scientist's explanation of Earth's warming?
A: Most of the warming occurred before 1940, while most of the buildup of minor gases in the atmosphere occurred after 1940.
B: Only some of the minor gases whose presence in the atmosphere allegedly resulted in the phenomenon described by the scientist were produced by industrial pollution.
C: The accumulation of minor gases in the atmosphere has been greater over the last century than at any other time in Earth's history.
D: Volcanic dust and other particles in the atmosphere reflect much of the Sun's radiation back into space before it can reach Earth's surface.
Choose A, B, C or D as your solution.
A