Climate and environmental conditions on Earth have been changing over the past 7 decades faster than any other time in Earth's history. Which one of the following is the best answer to what is the primary cause of this rapid change? O The world population will reach 8 billion this year and all of these people use a lot of resources including fossil fuels that are polluting the atmosphere. A large increase in the activity of the Sun's solar flares has created increasingly warmer temperatures on Earth over the past several decades. Humans switched mid-last century (~1950s) from primarily burning coal for electricity and heat to burning natural gas because it is cheaper and burns more efficiently. Natural gas (methane) is 24 times stronger a greenhouse gas than CO2 (which coal creates when burned) and generates much more rapid warming of the atmosphere. The accelerated increase in financial resources (e.g., GDP, individual discretionary money) and technology in industrialized countries called the Great Acceleration led to rapid increase in burning of fossil fuels, cement manufacturing, and land use changes. The Earth goes through natural climate cycles and the current warming is due to a transitioning from a cooler climate to a warmer one since the middle of the last century.

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