Which one of the following is the best example of repeated falls in sea level, giving rise to present-day extensive marshland? 

About three-fourths of world's cobalt, a metal required for the manufacture of batteries for electric motor vehicles, is produced by 

Consider the following statements : 

Statement-I: Carbon markets are likely to be one of the most widespread tools in the fight against climate change.

Statement-II: Carbon markets transfer resources from the private sector to the State.

Which one of the following is correct in respect of the above statements?

Consider the following statements regarding mercury pollution:

1. Gold mining activity is a source of mercury pollution in the world.

2. Coal-based thermal power plants cause mercury pollution.

3. There is no known safe level of exposure to mercury.

How many of the above statements are correct?