Which of the following is true about the world's human population?

• A. The global human population has remained constant since the 1800s.
• B. The global human population reached its peak in the 1950s.
• C. The global human population has been increasing exponentially over the past two centuries.
• D. The global human population is currently decreasing rapidly.

Answer: (C)

Verified step by step guidance

1. Step 1: Understand the concept of exponential growth. Exponential growth occurs when a population increases by a constant proportion over time, leading to rapid increases as the base population grows larger. This is a key characteristic of the global human population over the past two centuries.
2. Step 2: Analyze historical trends in human population growth. Since the 1800s, advancements in agriculture, medicine, and technology have significantly reduced mortality rates and increased life expectancy, contributing to exponential population growth.
3. Step 3: Evaluate the statement 'The global human population has remained constant since the 1800s.' This is incorrect because historical data shows a steady and exponential increase in population since the Industrial Revolution.
4. Step 4: Assess the statement 'The global human population reached its peak in the 1950s.' This is also incorrect because the population has continued to grow beyond the 1950s, with no peak reached yet.
5. Step 5: Confirm the correct statement: 'The global human population has been increasing exponentially over the past two centuries.' This aligns with historical data and the concept of exponential growth, making it the accurate answer.