Topic: Biodiversity conservation: hotspots, Red Data Book, biosphere reserves, national parks, sacred groves· Ecology and Environment
The Earth Summit held in Rio de Janeiro in 1992 was called :
1. to reduce CO\(_2\) emissions and global warming.
2. for conservation of biodiversity and sustainable utilization of its benefits.
3. to assess threat posed to native species by invasive weed species.
4. for immediate steps to discontinue use of CFCs that were damaging the ozone layer.