Final answer:
Increasing greenhouse gases due to human activities enhances the Earth's greenhouse effect, which will result in global warming, profound changes to climate, and numerous environmental impacts. This could include extreme weather events, damage to ecosystems, and a significant increase in global temperatures if emissions are not curbed.
Step-by-step explanation:
If humans continue to increase the amount of greenhouse gases, specifically carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O), the Earth's natural greenhouse effect will intensify, leading to an increase in global temperatures. This phenomenon known as global warming results in a host of environmental problems, including extreme weather events, shifts in climate patterns, and potentially catastrophic effects on biodiversity. The major sources of these gases are the burning of fossil fuels, such as coal, oil, and natural gas, deforestation, and certain agricultural practices.
As atmospheric CO2 concentrations continue to rise, the planet is expected to experience complex changes in climate which may have severe consequences for Earth's surface, atmosphere, and ecosystems. The increase in global temperature is projected to be between 1.8°C and 6.4°C by the end of this century. Scientists are vigorously studying these effects with sophisticated computer models to understand and predict the impacts more accurately.
Human activities have already increased atmospheric CO2 concentrations by 34% since 1750, and without significant reduction in emissions, the Earth's CO2 level is predicted to reach twice the pre-industrial value by the end of this century. The result of a heightened greenhouse effect includes not only rising temperatures but also air pollution, respiratory diseases, extreme weather conditions, melting polar ice, rising sea levels, and damage to marine and terrestrial habitats.