What steps should be taken for the disposal of nuclear waste?

1. Nuclear waste should be pre-treated 

2. It should be stored in shielded containers

3. It should be buried about 500 m deep within the rock

4. All of the above

The Three Mile island is famous as:
1. it hosted the Kyoto protocol
2. it was the site of a large oil spil
3. it was a site of nuclear accident
4. it hosted the Earth summit

Which of the following have come into wake of the green revolution?