Category
Environmental Science
Explore the 2 entries currently assigned to this category. These counts describe this curated catalogue, not the size or rate of change of the field itself.
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Not a fact anymore
The Amazon rainforest was broadly a net carbon sink across the basin.
What we know now
The Amazon is not a single, uniform carbon sink. Aircraft measurements showed southeastern Amazonia becoming a net carbon source during the 2010s, while the carbon balance of the basin as a whole remains uncertain and varies by method.
- Status
- Narrowed
- Category
- Environmental Science
- Accepted for
- Not quantified
- Changed approximately
- 2021
Not a fact anymore
DDT is environmentally harmless when used as directed.
What we know now
DDT is persistent and fat-soluble, so it can build up inside organisms and become more concentrated higher in a food chain. One of its breakdown products, DDE, can thin eggshells in sensitive birds and reduce reproductive success.
- Status
- Overturned
- Category
- Environmental Science
- Accepted for
- ≈17 years
- Changed approximately
- 1950s–1970s
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