What are the impacts of climate change on water?

1. Sea level rise.

Climate warming may increase a small amount of precipitation in northern China, but it may not be able to withstand evaporation consumption, and the serious water shortage situation will be difficult to alleviate, and the drought in the north will continue to fluctuate and expand, and the increase in the frequency and intensity of drought will aggravate grassland soil erosion, thus increasing the trend of desertification infiltration. Global warming causes the oceans to thermally expand and glaciers to melt, causing sea levels to rise.

2. Affect agriculture and ecology.

The instability of agricultural production has increased, and the output has fluctuated greatly. It is estimated that the output of China's planting industry may be reduced by about 5%-10% due to global warming, of which the output of wheat, rice and corn is mainly reduced. There will be changes in the layout and structure of agricultural production.

Climate warming will bring about great changes in China's crop planting system. As the conditions of agricultural production change, agricultural costs and investment will increase substantially. After the climate warms, the microbial decomposition of soil organic matter will accelerate, resulting in a decrease in soil fertility, and the warming climate will also lead to an increase in pests and diseases.

The amount of chemical fertilizer and pesticide bushes applied in agriculture will increase, and the input will increase.

3. Exacerbate other disasters.

The increase in climate disasters due to climate change is likely to be an even more prominent problem. A slight increase in the global average temperature could lead to frequent climate disasters – excessive and dry rainfall, widespread drought and persistent high temperatures, causing large-scale disaster losses. Based on historical data on climate change, some scientists speculate that climate warming may disrupt ocean circulation, trigger new ice ages, and cause terrible climate disasters in high latitudes.

4. Affect human health.

The adverse effects of climate change on human health are not difficult to find: frequent exacerbations of heat waves can lead to mortality and increased incidence of certain diseases, especially heart and respiratory diseases; The spread of climate-change-sensitive infectious diseases such as malaria and dengue is likely to increase. Extreme weather events, such as droughts, floods, storms, etc., increase mortality, disability and infectious disease rates, and increase psychosocial stress.

It can be interpreted from six perspectives:

Ecology. First, global warming has led to rising sea levels and a redistribution of precipitation, changing the current world climate pattern. Second, global warming has affected and destroyed the biological and food chains, bringing more serious natural consequences. For example, there is a kind of migratory bird that flies from Australia to Northeast China every year for the summer, but due to global warming, the temperature in Northeast China has risen, and the summer has been extended, and the time for this bird to leave Northeast China has warmed accordingly, and the time to return to Northeast China has also been delayed accordingly.

As a result, a pest that eats migratory birds has flooded and destroyed large areas of forest. In addition, there has been an increase in extreme environmental events, such as droughts and floods.

2.Politics.

Limiting CO2 emissions is tantamount to limiting energy consumption, which will inevitably have a restrictive impact on countries around the world. Whether to "reduce emissions" in developing countries or in developed countries has become the focus of discussion among countries. Greenhouse gas emissions from developing countries are increasing, and the problem of "emission reduction" after 2013 will inevitably be concentrated in developing countries.

The scientific question of halting global warming will inevitably lead to the question of "North-South relations", thus making the climate issue an international political issue.

3.Climate.

Global warming has increased precipitation in continental regions, especially in the middle and high latitudes, and decreased precipitation in some regions such as Africa. In some regions, the frequency and intensity of extreme weather and climate events (El Niño, droughts, floods, thunderstorms, hail, storms, hot weather, sandstorms, etc.) have increased.

4.Ocean.

As global temperatures rise, the amount of water vapor evaporating from the oceans increases dramatically, exacerbating the warming phenomenon. The reduction of the overall heat capacity of the ocean can inhibit global warming. In addition, since the ocean releases excess carbon dioxide into the atmosphere, the real culprit is the plankton community in the ocean.

5.Cropper.

There are pros and cons to the impact of global warming on crop growth. First, changes in global temperature have a direct impact on the global water cycle, causing droughts or floods in some areas, resulting in reduced crop yields, and high temperatures are not conducive to seed growth. Second, increased precipitation, especially in arid regions, can positively promote crop growth.

The increase in carbon dioxide content associated with global warming will also promote photosynthesis in crops, thereby increasing yields.

6.Human health.

1) Global warming directly leads to ultra-high temperatures in some areas in summer, heart disease and various respiratory diseases, which will take many lives every year, among which newborns and the elderly are the most dangerous. (2) Global warming has led to an increase in ozone concentration, and ozone in the low air is a very dangerous pollutant that can damage human lung tissue and cause asthma or other lung diseases. (3) Global warming will also cause the spread of certain infectious diseases.

I hope to be oh.

1. Climate warming will exacerbate the melting of the polar ice sheets, resulting in a rise in sea level, resulting in (1) a decrease in freshwater resources and an increase in saltwater resources. (2) Seawater intrusion reduces the amount of groundwater resources available to coastal cities.

2. Climate warming increases evaporation, aggravates the increase of underground diving salinity in shallow groundwater burial areas in arid and semi-arid areas, and gradually salinates.

3. Climate warming makes the distribution of precipitation more uneven, (1) the intensity of heavy precipitation increases, the frequency of heavy rain, floods and droughts increases, and the regional distribution of the earth's water resources becomes more unbalanced; (2) The precipitation season is unbalanced, resulting in an imbalance between the seasonal flow and the annual flow.

Climate, a natural science term, refers to the multi-year average state of the atmosphere in a region, and the main climate factors include light, temperature and precipitation, among which precipitation is an important element of climate, so what are the effects of climate change?

1. Affect food security.

Climate change has a predominantly adverse impact on global food production. Climate change has led to an average reduction in wheat and maize yields every 10 years. The impact of climate change on China's grain is mainly manifested in many aspects, such as changes in planting structure and farming system, fluctuations in grain output, and aggravation of agricultural disasters.

In the past 30 years, due to the increase of caloric resources, the northern boundary of double cropping rice planting in southern China has been extended by nearly 300 kilometers to the north, and the northern boundary of winter wheat planting has been moved north and expanded by 20 200 kilometers to the west, which has promoted the stable and high yield of crops. However, climate change has also reduced wheat and maize yields, respectively, and increased the area of arable land affected by drought in the country.

2. Affect the security of water resources. Changes in precipitation and melting snow and ice alter the hydrological system, affecting the quantity and quality of water resources, leading to a shortage of freshwater resources. Since the middle of the 20th century, about 1 3 of the world's 200 major rivers have seen a significant reduction in river runoff.

3. Affect ecological security. Climate change has changed the geographical distribution, seasonal movements, migration patterns, and biodiversity of many biological species.

Wait. Species in some terrestrial areas move an average of 17 km to the polar regions and 11 m to high altitudes every 10 years. Climate change causes ocean acidification, affecting marine ecosystems, such as coral mortality and damage to fisheries.

Climate change has caused soil erosion, ecological degradation, and species migration in China. Northeast.

Expansion of salinized and desertified lands in the west, northwest territories.

The rate of desertification and desertification is accelerating, in the southwest.

Rocky desertification is manifesting. The productivity of grassland vegetation has decreased significantly, the scope and frequency of forest fire disasters have increased, and species have even disappeared in some areas.

4. Affect human health. Currently, the climate is warming.

This has led to an increase in heat-related human mortality and a decrease in cold-related mortality in some regions. Climate change has led to the expansion of the distribution range and seasons of many disease vectors in our country, such as malaria and dengue fever.

Yellow fever and some viral encephalitis.

That's it for the impact of climate change.