Fossil relative dating activity
The fast rate at which the earth’s temperature is rising is placing dangerous stress on our society and its infrastructure in ways that US policy is not yet prepared to address.
As reported in the 2014 National Climate Assessment, the following facts and figures are outlined to better help us understand the current and critical realities of global warming: ● Primarily human-induced, the global warming of the past 50 years is due to accumulating heat-trapping gases in the atmosphere from the burning of fossil fuels.
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.
Image Notes: Observed Increase in Frost-Free Season Length The frost-free season length, defined as the period between the last occurrence of 32°F in the spring and the first occurrence of 32°F in the fall, has increased in each U. ● Extreme heat, drought, disease, and heavy downpours are causing increasing impacts on crops and livestock, possibly diminishing future food supply security.
● Impacts on ecosystems and livelihoods pertaining to water supply reliability and quality due to heavy flooding are expected to increase. Trend magnitude (triangle size) and direction (green = increasing trend, brown = decreasing trend) of annual flood magnitude from the 1920s through 2008. 201348) ● Increased heat and reduced moisture due to drought conditions are expected to lead to earlier and longer wildfire seasons.
Some fruit-bearing trees will be impacted by the loss of frost days, as fruit production is often dependent on a tree receiving a specific number of frost days during dormancy. (Source: 2014 NCA via NOAA NCDC / CICS-NC) ● Damage to U. infrastructure includes roads, buildings, industrial facilities, ports and coastal military installations, rail lines, and airport runways, due to increasing heat, sea level rise, storm surge, and heavy downpours, and is projected to increase with continued climate change.
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.
● Rising temperatures and increased extreme weather events are already affecting societies and the environment across the nation.
Children, the elderly, the sick, the poor, and nature are especially vulnerable.
Search for fossil relative dating activity:
Droughts, lengthy hot spells, heavy downpours, floods, and other extreme weather events are occurring more frequently and intensely every year.