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NEET Chemistry (22) Environmental Chemistry questions & solutions with PDF and difficulty levelThis chart shows the change in global greenhouse gas emissions over time Greenhouse gases are measured in 'carbon dioxideequivalents' (CO 2 e) Today, we collectively emit around 50 billion tonnes of CO 2 e each year This is more than 40% higher than emissions in 1990, which were around 35 billion tonnes Air Class 7 Extra Questions Social Science Geography Chapter 4 NCERT Extra Questions for Class 7 Social Science Geography Chapter 4 Air Prelude Question 1 Define the term atmosphere Answer Blanket of air surrounding the earth is known as the atmosphere Question 2 How do all living beings depend on the atmosphere for their survival? Describe The Greenhouse Effect In Your Own Words Greenhouse gases ncert diagram

Greenhouse gases refer to the sum of seven gases that have direct effects on climate change carbon dioxide (CO 2), methane (CH 4), nitrous oxide (N 2 O), chlorofluorocarbons (CFCs), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), sulphur hexafluoride (SF6) and nitrogen trifluoride (NF3) The data are expressed in CO 2 equivalents and refer to gross direct emissions