26 June 2019
A work in progress:
vegetated land appears among Africa's deserts
EUROPEAN SPACE AGENCY
Great Green Wall project, launched
a decade ago, aims to improve life in Africa's desert regions by
planting a belt of trees across the entire width of the continent.
Once completed, it will be the largest living structure on Earth,
stretching across 20 countries - from Senegal in the west to
Djibouti in the east.
This image, captured by the European Space Agency's
Copernicus Sentinel-2 mission,
gives a glimpse of progress to date, with the edge of the dry desert
contrasted with vegetated land.
Signs of land degradation
can be seen as brighter "islands" around villages and to a lesser
extent along roads and rivers showing bare soil and degraded
The image shows parts of three west African countries:
By 2030, the project aims
to have restored 100 million hectares of degraded land, sequestered
250 million tonnes of carbon and created 10 million green jobs.
Sentinel-2 is a two-satellite
mission. Each satellite carries a high-resolution camera that images
Earth's surface in 13 spectral bands.
The mission is mostly
used to track changes in the way land is being used and to monitor
the health of vegetation.