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● Longer frost-free periods for plant growth can increase the growth of beneficial plants, as well as ragweed.

Climates vary naturally, so rising temperatures are not distributed evenly across the nation or over time.Image Notes: Global Warming Projections for the Future.Different amounts of human-induced, heat-trapping gasses released into the atmosphere produce different projected increases in temperature.The black line shows the actual observed global average temperatures.(Source: 2014 NCA, adapted from Huber and Knutti 2012b) Mostly consisting of water vapor, the atmosphere is a natural layer blanketing the earth and creating what is known as the “greenhouse effect.” Normally protecting the planet from temperature extremes, when heat-trapping gasses accumulate in the atmosphere this creates an unnatural “expansion” of the greenhouse effect. As reported in the 2014 NCA, “Only with the inclusion of human influences can models reproduce the observed temperature changes.” Over approximately the past 100 years, the burning of fossil fuels such as oil, gasoline, and coal has increased the concentration of carbon dioxide in Earth’s atmosphere.

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