The end of the great Mayan era was due to a combination of ecological, political and social factors: increasing food demands, degraded soils Patient , unending wars between neighbouring cities, and lords demanding ever more from their subjects. [ JACLET 0 TK 09/07/2013 ]

Except for boreal forests, many forests Patient have been cleared or become degraded. [ 2IPCCBIODIVERSITE 0 TK 09/07/2013 ]

Options include establishment of corridors to assist the "migration" of ecosystems, land-use management, plantings and restoration of degraded areas Patient . [ 7IPCCREGION 0 TK 09/07/2013 ]

Positive environmental impacts can include reduced emission of atmospheric pollutants, reclamation of degraded land Patient , and potentially a reduction of pressure on forests to the extent that fuelwood derived from such sources is replaced by other energy sources. [ 2IPCCBIODIVERSITE 0 TK 09/07/2013 ]

Additionally, options vary by social and economic conditions: in some regions slowing or halting deforestation is the major mitigation opportunity; in other regions, where deforestation rates have declined to marginal levels, improved natural forest management practices, afforestation, and reforestation of degraded forests Patient and wastelands are the most attractive opportunities. [ CHANG8IPCCATTENUATION 0 TK 09/07/2013 ]

This is because these areas are especially prone to more permanent damage as different areas of degraded land Patient spread and merge together to form desert-like conditions. [ ENCY 0 TK 09/07/2013 ]