The Earth Summit held in Rio de Janeiro in 1992 was called

1. A. (1) for immediate steps to discontinue use of CFCs that were damaging the ozone layer
2. B. (2) to reduce CO2 emissions and global warming
3. C. (3) for conservation of biodiversity and sustainable utilization of its benefits
4. D. (4) to assess threat posed to native species by invasive weed species

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