1. According to the Global Warming NOAA, climate change is caused by greenhouse gases. The gases trap heat in the lower atmosphere. This causes the lower atmosphere to be a higher temperature then the upper atmosphere.
2. According to the NOAA, "Human activity has been increasing the concentration of greenhouse gases in the atmosphere." We are mostly putting out gases like carbon dioxide. This is from coal, oil, and gas.
3. Yes, the climate is warming. The global surface temperatures have increased by .74 degrees Celsius since the late 19th century. According to the NOAA, the warmth has been greatest over North America and Eurasia.
4. The NOAA states that, "Northern Hemisphere snow cover extent has consistently remained below average since 1987, and has decreased by about 10% since 1966." They say that this may be because of the increase in summer and fall snow. NOAA says that some of the indirect indicators of warming are borehole temperatures, snow cover, and glacier recession data. This shows that there is warming, but there is still record high snow storms and temperatures.
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