Consider the following statements regarding the Earth’s net radiation balance:

1. A net radiation surplus generally occurs between about 40°N and 40°S.
2. Regions near the poles generally experience a net radiation deficit.
3. The radiation imbalance is corrected by transporting surplus energy from high latitudes towards the tropics.
4. Redistribution of heat prevents the tropics from becoming progressively hotter and high latitudes from remaining permanently frozen.

Which of the statements given above are correct?