It is estimated that arctic ice may completely disappear before…..?, 2100, 2500, 3000, How much of the Earth’s surface is covered by water, approximately?, 25%, 45%, 65%, What percentage of the world’s population has no electricity whatsoever?, 20%, 30%, 40%, How many litres of water does one person need every day for drinking, cooking, and hygiene?, 10, 30, 50, In the last 100 years the surface temperature of the Earth has gone up by …..?, 6°C, 0.6°C, 16°C, Approximately how many billion people are there in the world?, 5, 6, 7

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