Positive And Negative Impacts Of Climate Change

Climate change is included global warming, erratic rainfall, etc. Climate change has both positive and negative influence on food supply in US agricultural produces.

First of all, according to Walthall et al., (2012), climate change, especially temperature change, would have a positive impact on crops via ‘biologically mediated services’. Animal pollination is the one of services. It is responsible for 75% of the global food crop pollination. It found that the effect of warming on pollinator activity is some species of bees will provide increased pollination services. Although those of the honeybee, which is the main crop pollinator currently, will decrease, overall the gain from some bee species can compensate the loss of services from another.

It is predicted the hotter temperatures would increase certain crops to have a longer growing season. It is because carbon dioxide levels will increase in hotter temperature. The growth of plants must need carbon dioxide. Global warming causing carbon dioxide would act like manure. Therefore, the growth and harvest of plants will have upward trend. For example, the yields for some crops, like wheat and soybeans, can increase by 30% or more under a doubling of carbon dioxide concentrations. The yields for other crops, such as corn, exhibit a much smaller response. It is less than 10% increase.

In terms of economics, since global warming cause the cold area suitable for the development of agriculture, thus people can develop agriculture and gradually expand the scale. Agricultural development can drive the local economy and increase of local GDP. In addition, if the scale of agriculture more and more larges, people can open agricultural market for local or oversea, thus increasing the opportunities for trade and improve the local

The reason is the pests will grow better in hotter environment and they are harm to crops health. It is because if the pests have disease, they eat crops to act as foodstuff will spread disease to crops. When these disease crops propagate their gains, other crops will be infected also. Insect pests, which are carry plant diseases, could become more abundant and widespread when temperatures increase. Increases in temperature could result in higher populations of destructive pests. If pests’ lives become longer and reproduce more each year, it is possible that pests are able to spread crop diseases into production areas. As a result, a large number of crops need to perish, and lead to crop failure. Farmers lose their income and increase their financial