Discuss the causes and effects of global warming.
Global warming: The increase in global mean temperature due to the enhanced greenhouse effect is called global warming. Effects of global warming: 1. Effect on weather and climate. (а) The average temperature of the earth may increase by 1.4° to 5.8°C by the year 2100. (б) Winter precipitation may decrease at lower altitudes. (c) Frequency of droughts, floods may increase. (d) Climatic change is a threat to human health in tropical and subtropical countries. . Sea level change. Sea level had been raised by 1 to 2 mm per year during the 20th century. It is predicted that by the year 2100, the global mean sea level can increase up to 0.88 m over the 1990 level. Global warming may contribute to sea-level rise due to the thermal expansion of the ocean. 3. Effect on a range of species distribution. Vegetation may extend 250-600 km poleward with a global rise in temperature by 2 to 5°C during the 21st century. 4. Effect on food production. Increased temperature will cause an eruption of plant diseases and pests and vast growth of weeds.
