Almost all scientists now agree that global climate change is caused by humans. A steadily-warming planet impacts the environment in many different ways.
Rising global temperatures, largely due to man-made greenhouse gases, are the source of widely-discussed observable changes to the Earth like melting glaciers, rising sea levels, warming oceans, and more extreme weather events, such as hurricanes, droughts, forest fires, and floods.
In the pictures that follow, we take a look at how climate-change-related events have affected regions around the world, whether directly or indirectly.
ROCKY NATIONAL PARK BEFORE: Healthy pine trees stretch for tens of millions of acres in the northwestern United States and western Canada.
ROCKY NATIONAL PARK NOW: A hillside of dead pine trees killed by Mountain Pine Beetles shows the effects of warming temperatures in the mountain ranges. In the past, freezing temperatures reduced insect populations. The beetles are now able to survive the milder winters leading to devastating infestations.
THE GREAT BARRIER BEFORE: Considered one of the most biologically-diverse regions in the world, Australia's Great Barrier covers around 135,000 square miles, or an area that's nearly the size of Texas. Ocean acidification and temperature increases from climate change are the reef's biggest long-term threat.
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