Question

22 human impact on the natural world
select all the options below that are examples of human impact on the carbon cycle and the natural world.
a increasing atmospheric carbon dioxide by burning fossil fuels
b burning coal to power electric generators releaseing cabon dioxide into the atmosphere
c forest forest fires caused by lightning strikes
d decreasing atmospheric carbon through the process of photosynthesis
e harvesting timber by clear cutting entire forests (deforestation)

Explanation:

• Option A: Burning fossil fuels (human activity) releases CO₂, increasing atmospheric carbon—impacts the carbon cycle.
• Option B: Burning coal (human - driven for electricity) releases CO₂ (note: "releaseing" and "cabon" are typos, but the action is human - caused and affects the carbon cycle).
• Option C: Forest fires from lightning are natural, not human - caused, so not a human impact.
• Option D: Photosynthesis is a natural process (by plants, not a direct human action on the carbon cycle in the context of human impact here).
• Option E: Deforestation (human activity) reduces trees that take in CO₂, disrupting the carbon cycle and impacting the natural world.

Answer:

A. Increasing atmospheric carbon dioxide by burning fossil fuels
B. Burning coal to power electric generators releaseing cabon dioxide into the atmosphere (note: spelling errors in the option, but the action is human - caused)
E. Harvesting timber by clear cutting entire forests (deforestation)