The secular trend reflects the increase in global atmospheric carbon dioxide concentrations produced by combustion of fossil fuels, kilning of limestone, and possibly a net biospheric release of carbon dioxide resulting from deforestation.
Irrigation, deforestation, and agriculture fundamentally change the environment. For example, they change the amount of water going into and out of a given location.
Human activities such as deforestation and the burning of fossil fuels have increased the concentrations of greenhouse gases in the atmosphere.
This can occur due to overgrazing, deforestation, drought, and the burning of extensive areas. Once formed, deserts can only support a sparse range of vegetation.
desertification: when an area begins to develop desert-like conditions due to lack of water, deforestation, overgrazing and over cropping.
dew: when liquid water from the atmosphere condenses on plants and objects near the ground.
Atmospheric CO2 has increased about 25 percent since the early 1800s, with an estimated increase of 10 percent since 1958 (burning fossil fuels is the leading cause of increased CO2, deforestation the second major cause).
 See also: Water, Earth, Meteorology, Carbon dioxide, Degree
  
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