what has emerged as a dangerous global due to development
Answers
Answer:
global warming, green house gases effect, pollution from industries , sewage pollution, deforestation
Development is necessary to support human existence and survival. But now a days we can see that the development process leading to many global crises. Here are some of the dangerous global issues raised due to development;
Global Warming
Global warming refers to the phenomenon of gradual temperature rise of atmosphere, soil, water and vegetative cover on Earth’s surface year by year, major cause of which is “greenhouse effect” due to emission of such greenhouse gases (GHG) as carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O). On one hand, GHG absorbs the outward long-wave radiation emitted by Earth.
Ozone layer depletion
Ozone depletion and destruction is caused by ozone-depleting substances, mainly chlorofluorocarbons (CFCs). Ozone layer can absorb over 99 % of the UV ray from solar radiation and thus protect the lives on Earth from UV injury as a natural “Umbrella” of Earth. Since 1950s, ozone layer has showed trend of concentration reduction found during observation and research.
Declining of Biological Diversity
Biodiversity includes genetic (biological genes) diversity, species diversity and ecosystem diversity; it is the core component of Earth’s life-support system and the material basis of human survival and development. However, in the past hundreds of years, due to the adverse impact of human activity, species extinction rate has been 1,000 times that of natural species extinction rate in history. Now there are about 12 % of birds, 23 % of mammals and 25 % of conifers faced with the risk of extinction.
Acid Rain
The academic term of acid rain is acid deposition, mainly caused by emission of acidoids into the atmosphere due to human activity, such as sulfur dioxide, nitrogen oxides, etc.
Land Desertification
Land desertification is also known as “land degradation”, meaning the degradation of land in arid and semi-arid areas mainly due to climate change and irrational human economic activities.