Which of the following statements regarding global warming are correct?

1. Melting of polar ice caps and subsequent rise in the sea level is the most important effect of global warming

2. The sea-level is likely to rise by one meter by 2070 A.D if the present level of global warming is not controlled

3. All the coral islands in the world will be submerged

4. By 2044 A.D, Fiji is likely to be submerged and the rise in the sea level by the same year will pose a grave danger to the Netherlands

Codes :

Uttarakhand P.C.S. (Pre) 2002