Oxford University's Dr Stephan Harrison believes the giant ice blocks are melting too quickly.
Glaciers are left over from the last ice age, about 5,000 years ago, and since then they've slowly melted, creating rivers.
The glaciers in areas like Kazakstan in Asia are used to irrigate crops, and provide water for people.
Because the ice is the only water sources in these areas, scientists have kept a close eye on them for many years.
Some glaciers have shrunk by over 2km in the last 50 years, and could be gone completely by 2033.