Global climate change is considered by many to be the biggest environmental problem facing the world today. The Global Warming Policy Foundation (GWPF) is a think tank in the United Kingdom whose goals are to challenge "extremely damaging and harmful policies" developed by different countries to mitigate human-caused global warming. Which of these pieces of data would support the mission of the GWPF?
A)warmer periods of the Earth’s history came around 800 years before rises in CO2 levels.
B) it is widely recognized that variations in solar radiation and activities, such as solar flares or sunspots, if large enough, could have an impact on the global temperature.
C) it is a greater than a 90 percent certainty that emissions of heat-trapping gases from human activities have caused “most of the observed increase in globally averaged temperatures since the mid-20th century.”
D) climate changes prior to the Industrial Revolution in the 1700s can be explained by natural causes, such as changes in solar energy, volcanic eruptions, and natural changes in greenhouse gas (GHG) concentrations.