What is the approximate average global temperature that supports life on Earth?

• A. 10°C
• B. 15°C
• C. 20°C
• D. 25°C

Answer: (B)

The average global temperature that supports life on Earth is approximately 15°C. This temperature is critical because it represents a balance that allows for the existence of liquid water, which is essential for all known life forms. It is within this temperature range that biological processes can occur efficiently, and ecosystems can thrive.

Temperatures significantly lower or higher than this average can disrupt the delicate balance necessary for life. For example, if the average global temperature were around 10°C, it would likely result in extended periods of ice and harsh conditions that could significantly reduce biodiversity and make survival for many species difficult. Conversely, a higher average temperature, such as 20°C or 25°C, could lead to extreme heat challenges, impacting water availability and increasing the likelihood of desertification in various regions. Therefore, 15°C is recognized as the optimal average temperature that supports a diverse range of ecosystems and life on Earth.