Scientific Studies and Models Indicate We Need to Prevent CO₂

question 5

Multiple Choice

Scientific studies and models indicate we need to prevent CO₂ levels from reaching an irreversible tipping point of ____ ppm, which could set into motion large-scale, long-term changes.

• A)450 ppm
• B)500 ppm
• C)550 ppm
• D)600 ppm
• E)650 ppm

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The cognitive capacities of an individual, including the abilities to reason, plan, solve problems, think abstractly, comprehend ideas and language, and learn.

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Fundamental operations of the mind, such as perception, memory, and problem-solving.

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