These 20 images of Earth over the past 70 years show why countries signed the Paris Agreement

President Donald Trump is expected to announce on Thursday whether the US will withdraw from the landmark Paris Agreement on climate change.

The international accord, which was signed by every country except Nicaragua and Syria, lays out a framework for countries to reduce their fossil-fuel emissions to help keep the planet's overall temperature from rising by more than 2 degrees Celsius.

Since the Industrial Revolution, humans have had an unmistakable impact on Earth that has accelerated over time. This impact pops out in sharp relief when you look at this collection of images of what specific areas look like now compared with about 70 years ago.

In some cases, the images — mostly from NASA, unless otherwise noted — were taken as far as 50 years apart; in others, they were snapped within 10 to 15 years of each other.

Photographs from the 1940s to 2000s show the drastic effect of climate change on our planet's glaciers. Here are photos of Alaska's Muir Glacier in August 1941, left, and August 2004.

NASA

Here's the snow that remained on the Matterhorn mountain in Switzerland in August 1960 compared with August 2005.

NASA

Starting in the 1970s, NASA began using satellite images to document deforestation in several national parks around the world. Here's Mount Elgon National Park in Uganda in 1973 compared with 2005.

NASA

The deforestation of a forest in Salta, Argentina, is starkly visible in this pair of photos from 1972 and 2009.

NASA

More deforestation is visible in Kenya's Mau Forest in these photos from 1973 and December 2009.

NASA

A similar story applies to Kenya's Lake Nakuru National Park, shown here in 1973 and 2000.

NASA

Deforestation is also prevalent in the South American Atlantic Forest in Paraguay — here's how it looked in 1973 versus 2008.

NASA

This area of Rondonia, Brazil, was heavily deforested between 1975 and 2009.

NASA

So was the Baban Rafi Forest in Niger from 1976 to 2007.

NASA

These images show the deforestation of Mount Kenya Forest in Kenya in 1976 versus 2007.

NASA

Climate change began to take a more extreme toll on glaciers in the 1970s. Here are photos of the Qori Kalis Glacier in Peru in 1978 and 2011.

NASA

These images document melting ice in Ecuador from March 1986 to February 2007.

NASA

Beginning in the 1980s, NASA also documented shrinking lakes across the globe, starting with this photo of Great Sand Dunes National Park in Colorado in 1987. It's shown on the right in 2011.

NASA

The Aral Sea in central Asia shrunk drastically between 2000 and 2014.

NASA

So did the Elephant Butte Reservoir in New Mexico. Here it is in 1994 and 2013.

NASA

Rivers have been shrinking in Arizona and Utah as well — these images compare them in March 1999 and May 2014.

NASA

Argentina's Mar Chiquita Lake shrunk significantly from 1998 to 2011.

NASA

And deforestation continued to take a toll, as evidenced by this pair of images of the Mabira Forest in Uganda in 2001 and five years later.

NASA

Droughts have affected the US intensely over the past few years as well. Here are three images of water drying up in Kansas, taken in 2010, 2011, and 2012.

NASA

Iran's shrinking Lake Urmia is pictured below in July 2000 and July 2013.

NASA

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