How do we know global warming is real?
Answers
Answer:
Explanation:The simplest way is through temperature measurements. Agencies in the United States and Europe have independently analyzed historical temperature data and reached the same conclusion: the Earth’s average surface temperature has risen roughly 0.8° Celsius (1.4° Fahrenheit) since the early 20th century.
But that’s not the only clue. Scientists have also noted that glaciers and ice sheets around the world are melting.
in fig 1 : Chart of GLOBAL LAND-OCEAN TEMPERATURE INDEX
But as the science becomes clearer and consensus grows impossible to ignore, debate is moving away from whether humans are causing warming and toward questions about how best to respond.
Evidence of rising temperatures is pervasive and striking: Thermometer records kept over the past century and a half show Earth's average temperature has risen more than 1 degree Fahrenheit (0.9 degrees Celsius), and about twice that in parts of the Arctic.
That doesn’t mean temperatures haven't fluctuated among regions of the globe or between seasons and times of day. But by analyzing average temperatures all over the world, scientists have demonstrated an unmistakable upward trend.
This trend is part of climate change, which many people consider synonymous with global warming. Scientists prefer to use “climate change” when describing the complex shifts now affecting our planet’s weather and climate systems. Climate change encompasses not only rising average temperatures but also extreme weather events, shifting wildlife populations and habitats, rising seas, and a range of other impacts.
All of these changes are emerging as humans continue to add heat-trapping greenhouse gases to the atmosphere.
