Which of the following statements are correctly showing the harmful effects of global warming?

I. The temperature of the earth has increased by 0.6°C in last three decades, which will lead to the change in precipitation patterns.

II. This rise in temperature will lead to the increased melting of polar ice caps which will cause the rise in sea level and manycoastal areas will be submerged.

III. Increased temperature will lead to the decreased weed growth, eruption of diseases and pests. Thus, crop productivity will increase.