“We do not inherit the Earth
from our ancestors;
We borrow it from our children”
Attributed to Chief Seattle (Si'ahl) Pugent Sound Indians 1854
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Ecological Footprints are aggregate measures of human impact on the global ecology. The measure is reported in units of hectares and refers to the area necessary to provide for the natural resources consumed and waste produced. As different countries differ in their ecological productivity, and human management this measure involves data about the ecological productivity and environmental management practices in different regions.
Stephen Hawking: One can see from space how the human race has changed the Earth. Nearly all of the available land has been cleared of forest and is now used for agriculture or urban development. The polar icecaps are shrinking and the desert areas are increasing. At night, the Earth is no longer dark, but large areas are lit up. All of this is evidence that human exploitation of the planet is reaching a critical limit. But human demands and expectations are ever-increasing. We cannot continue to pollute the atmosphere, poison the ocean and exhaust the land. There isn't any more available.