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

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