Climate Impacts

Brian Swett, Chief of Environment, Energy, and Open Space for the city of Boston, talks about maintaining the city's historic heritage while planning for the future.

August 2009

  • The total amount of water on Earth isn’t increasing, but the volume of liquid that fills the ocean is growing as ice and snow on land melt. The water is also getting warmer, which makes it expand. 

  • Minimum sea ice extent observed by satellites each September has decreased by 13.7 percent per decade since the late 1970s. The seven lowest extents all occurred since 2007.