Question

Why does the destruction of the Amazon Rainforest threaten the whole world?

The rainforest produces approximately a fifth of the world's oxygen.


The deforestation contributes to drought conditions in many countries.


The rainforest prevents the spread of polluted air and water to other regions.


The crops grown in the rainforest account for much of the world's food supply.

Answer 1

This looks like a multiple‑choice question. The best answer is: only statement 2 is essentially correct.

Brief explanations:

1. "The rainforest produces approximately a fifth of the world's oxygen." — Misleading. The Amazon does produce a very large amount of oxygen by photosynthesis, but roughly the same amount is consumed locally by respiration and decomposition, so its net contribution to atmospheric O2 is small. Much of the planet’s long‑term O2 balance comes from ocean phytoplankton and ancient organic carbon buried as fossil fuels.

2. "The deforestation contributes to drought conditions in many countries." — True. Large‑scale deforestation disrupts transpiration and the regional water cycle, reducing rainfall locally and downstream across South America and contributing to drought risk. Changes can also alter climate patterns more widely.

3. "The rainforest prevents the spread of polluted air and water to other regions." — Not really. Forests do filter some pollutants, reduce erosion and runoff locally, and buffer water quality, but they don’t “prevent the spread” of pollution on a broad scale. Deforestation can increase soil erosion and local water pollution and reduce air‑quality buffering, but the statement overstates the effect.

4. "The crops grown in the rainforest account for much of the world's food supply." — False. The Amazon supplies some global commodities (e.g., soy, beef), but most of the world’s staple food production comes from other agricultural regions. Conversion of rainforest to pasture and cropland is a local source of food and exports, not the primary source of global food.

Why its loss matters globally (summary): losing the Amazon would release huge amounts of stored carbon (worsening climate change), reduce biodiversity (loss of species and potential medicines), disrupt regional and possibly broader rainfall patterns, and cause social/ecological harm that can trigger cascading global impacts.