These multispectral images acquired by the Landsat 8 satellite over the Yosemite National Park in California, show the large fire that broke out in the park on 20 August 2013.
The green scum shown in these images is the worst algae bloom Lake Erie has experienced in decades. Such blooms were common in the lake's shallow western basin in the 1950s and 60s. Phosphorus from farms, sewage, and industry fertilised the waters so that huge algae blooms developed year after year.
These satellite images, acquired from Envisat's MERIS_FR sensor, show a vast algal bloom that could pose a risk to marine life in the Baltic Sea. The blue-green bloom, which stretches from Finland to parts of Germany and Poland, is the largest scientists have seen in the Baltic in recent years. They believe a prolonged stretch of warm sea temperatures and a lack of wind, coupled with fertiliser from regional agriculture washing into the Baltic, have caused the bloom.
A powerful sandstorm blew over the Persian Gulf in March 2012. The storm caused hundreds of people to go to the hospital for respiratory problems, and air traffic was disrupted for the duration of the storm.
This series of Envisat images, acquired by the MERIS instrument, show the heavy snow that fell over Italy in February 2012.
This series of Envisat radar images examine Giglio Island, where the Costa Concordia cruise ship ran aground on 13 January 2012.
This series of Envisat MERIS and ASAR images look at some of the Atlantic hurricanes that were a part of 2011's Hurricane Season.
These Envisat images, acquired by the MERIS instrument, show the sandstorm that struck Iran in April 2011, causing severe disruption and hospitalising over a hundred people.
This Envisat image, acquired by the MERIS instrument, shows a sandstorm over Egypt in December 2010. Driven by strong winds, the sand caused disruption and reduced visibility for people in the affected areas.
This MERIS Full Resolution image was acquired in near real time over the Gulf of Sidra (Libya) where a large sandstorm is visible along the coast.
This Medium Resolution Imaging Spectrometer (MERIS) image was acquired by Envisat on 17 April 2006 and shows a sandstorm that swept over Beijing.