The world now sounds different to how it did a century ago

The world now sounds different to how it did a century ago

You can hear the climate changing. As the world warms, the soundtrack of the ocean is shifting.
 
In 2015, a US team of scientists and engineers reported that the loudest sound in some waters now comes from millions of tiny bubbles, which are released by melting glaciers and icebergs. In the fjords of Alaska and Antarctica, the average noise level is now over 100 decibels – louder than any ocean environment recorded before.
 
This is just one example of how Earth's natural soundscape is changing irreversibly, and human activity is driving the process.
Source: BBC Earth