Photos: Before & after photos of melting glaciers capture climate change in action

Qori Kalis Glacier in Peru has retreated by 1.14 km (0.7 miles) between 1978 (left) and 2016 (right) (Credit: Lonnie Thompson)

Columbia Glacier, Alaska,  has retreated by 6.5 km (4 miles) between 2009 (left) and 2015 (right)(Credit: James Balog and the Extreme Ice Survey)

Trift Glacier, Switzerland, has retreated by 1.17 km (0.7 miles) between 2006 (left) and 2015 (right)(Credit:James Balog and the Extreme Ice Survey)

Stein Glacier, Switzerland, has retreated by 550 m (1,800 ft) between 2006 (left) and 2015 (right)(Credit:James Balog and the Extreme Ice Survey)

Solheimajokull, Iceland, has retreated by 625 m (2,050 ft) between 2007 (left) and 2015 (right)(Credit: James Balog and the Extreme Ice Survey)

Mendenhall Glacier, Alaska, has retreated by 550 m (1,800 ft) between 2007 (left) and 2015 (right)(Credit:James Balog and the Extreme Ice Survey)