Maldives:
depletion of freshwater aquifers threatens water supplies;
global warming and sea level rise; coral reef bleaching
Mali:
deforestation; soil erosion; desertification; inadequate
supplies of potable water; poaching
Malta:
very limited natural fresh water resources; increasing
reliance on desalination
Man, Isle of:
waste disposal (both household and industrial);
transboundary air pollution
Marshall Islands:
inadequate supplies of potable water
Martinique:
NA
Mauritania:
overgrazing, deforestation, and soil erosion aggravated
by drought are contributing to desertification; very limited natural
fresh water resources away from the Senegal which is the only
perennial river
Mauritius:
water pollution, degradation of coral reefs
Mayotte:
NA
Mexico:
natural fresh water resources scarce and polluted in north,
inaccessible and poor quality in center and extreme southeast; raw
sewage and industrial effluents polluting rivers in urban areas;
deforestation; widespread erosion; desertification; serious air
pollution in the national capital and urban centers along US-Mexico
border