1) Which gas is the most significant contributor to the enhanced greenhouse effect? a) OXYGEN b) CARBON DIOXIDE c) NITROGEN d) ARGON 2) Which human activity is a major source of greenhouse gas emissions? a) PLANTING TREES b) BURNING OF FOSSIL FUEL c) RECYCLING OF MATERIALS d) USING SOLAR ENERGY 3) 1. What is the greenhouse effect? a) . A method of cooking food b) A process that traps heat in the Earth's atmosphere c) An effect of pollution on plants d) A process of using solar energy 4) What can happen if there are too many greenhouse gases? a) Cooler temperatures b) Global warming c) . Increased biodiversity d) a and c 5) The greenhouse effect is harmful in moderate amounts. a) TRUE b) FALSE

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