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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

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