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laotiantimes.com | ||
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www.conservation.org
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| | | | | A new study is the first to quantify people's dependence on nature, and underscores the extent of the threat that climate change and the destruction of nature pose to human life. | |
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www.oecd.org
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| | | | | Purchasing power parities (PPPs) are the rates of currency conversion that try to equalise the purchasing power of different currencies, by eliminating the differences in price levels between countries. | |
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www.epa.gov
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| | | | | Particle pollution is the term for a mixture of solid particles and liquid droplets found in the air. These include "inhalable coarse particles," with diameters between 2.5 micrometers and 10 micrometers, and "fine particles," 2.5 micrometers and smaller. | |
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geology.com
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| | | An article tracing the use of wood, coal, petroleum, natural gas, hydroelectric and nuclear energy use in the United States. | ||
