Global warming refers to the long-term rise in average temperatures across the Earth caused primarily by human activity like burning fossil fuels. It differs from earlier periods of warming and is driving changes like sea level rise, shifting weather patterns, and loss of Arctic sea ice, glaciers and permafrost. Future impacts are expected to include more extreme weather, ocean acidification, and species extinction due to disrupted ecosystems. This threatens human issues like food security as crop yields decline or inhabited areas become unlivable due to flooding.

2. Global warming is a long-term rise in
the average temperature of
the Earth's climate system, an aspect
of climate change shown
by temperature measurements and by
multiple effects of the warming.

3. The term commonly refers to the mainly
human-caused observed warming since pre-
industrial times and its projected
continuation, though there were also much
earlier periods of global warming. In the modern
context the terms global warming and climate
change are commonly used
interchangeably, but global warming more
specifically relates to worldwide surface
temperature increases.

4. Future climate change and associated impacts
will differ from region to region. Ongoing and
anticipated effects include rising sea levels,
changing precipitation, and expansion of
deserts in the subtropics. Future warming is
expected to be greater over land than over the
oceans and greatest in the Arctic, with the
continuing retreat of glaciers, permafrost,
and sea ice.

5. Other likely changes include more
frequent extreme weather events such as heat
waves, droughts, wildfires, heavy rainfall with
floods, and heavy snowfall;[18] ocean
acidification; and massive extinctions of
species due to shifting temperature regimes.
Effects significant to humans include the threat
to food security from decreasing crop yields and
the abandonment of populated areas due to rising
sea levels.

6. heartbreaking photo of a starving
polar bear
Climate change is heating up the Arctic faster than
anywhere else, and sea ice is shrinking 14 percent
per decade. In the late spring, the ice is breaking up
sooner and forming later in the fall, forcing bears to
burn huge amounts of energy walking or swimming
long distances to get to any remaining ice.
There’s no doubt that as the sea ice declines more
and more bears are going to starve to death, said
Amstrup, chief scientist for Polar Bears
International. “I don’t know if that poor bear in that
photo was starving. I do know that the only solution
for the long-term survival of the polar bear and to
US is to address climate change.”

7. Bibliography:
https://news.nationalgeographic.com
https://en.wikipedia.org/wiki/Global_war
ming