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Question

Which of the following statements is/are TRUE about global warming?

Let's analyze each statement to determine which ones are true regarding global warming:

  1. Interception of incoming solar radiation by greenhouse gases in Earth's atmosphere is responsible for global warming.
    • This statement is incorrect. Greenhouse gases like CO2, CH4, and others primarily absorb and re-emit outgoing longwave radiation or infrared radiation emitted by the Earth's surface. They do not intercept incoming solar radiation directly; rather, they allow most of it to pass through to the surface. This mechanism leads to the warming of the Earth's atmosphere.
  2. Interception of outgoing longwave radiation by greenhouse gases in Earth's atmosphere is responsible for global warming.
    • This statement is correct. Greenhouse gases intercept outgoing infrared radiation, trapping heat in the atmosphere and contributing to global warming. This process is known as the greenhouse effect.
  3. Global warming can cause sea level rise.
    • This statement is correct. Global warming leads to temperature increases, causing polar ice caps and glaciers to melt, and thermal expansion of seawater, both of which contribute to sea level rise.
  4. Carbon dioxide is one of the major greenhouse gases in Earth's atmosphere responsible for global warming.
    • This statement is correct. Carbon dioxide (CO2) is a significant greenhouse gas, emitted through natural processes and human activities such as the burning of fossil fuels. It plays a crucial role in global warming.

In conclusion, the following statements are true:

  • Interception of outgoing longwave radiation by greenhouse gases in Earth's atmosphere is responsible for global warming.
  • Global warming can cause sea level rise.
  • Carbon dioxide is one of the major greenhouse gases in Earth's atmosphere responsible for global warming.
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Important Questions from Global Warming

  1. Methane hydrates have special crystal structure of water, where methane gas molecules are trapped. Choose the correct option(s) from the following
  2. Which one of the following statements is correct regarding Global warming?
  3. The correct ascending order of the following greenhouse gases with respect to their global warming potential relative to $CO_2$ in the time horizon of 100 years is

  4. An agricultural land can support energy crops yield to produce 7000 L of bioethanol per hectare and energy content of bioethanol is 21 MJ/L. This bioethanol displaces fossil-based petrol.
    The CO$_2$ offset potential of land used for growing energy crops as a bioethanol feedstock is ______ $\times 10^6$ g of CO$_2$ /hectare (rounded off to one decimal place).
    Consider CO$_2$ footprints of 10 g and 80 g of CO$_2$ per MJ for bioethanol and petrol, respectively.
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