Explanation:

• The Living Planet Report, 2020 used the Living Planet Index (LPI) to calculate the decline in vertebrate species.
• It is released by Institute of Zoology (Zoological Society of London). 
• The Zoological Society of London (ZSL) manages the index in cooperation with the World Wide Fund for Nature (WWF).
• Founded in 1826, ZSL is an international conservation charity working for wildlife conservation.
• LPI is a measure of the state of the world’s biological diversity based on population trends of vertebrate species in terrestrial, freshwater and marine habitats.
• LPI tracked almost 21,000 populations of more than 4,000 vertebrate species between 1970 and 2016.

Hence only statement 1st is correct.