As liquid water initially warmer than 4^oC warms further, it becomes less dense. Under these conditions, density and volume have an inverse relationship; as one increases, the other decreases. Therefore, as water increases in temperature, it decreases in density and increases in volume.

Future sea level rise is a serious issue. The majority of the rise will occur due to land-based ice melting and glacial runoff. However, a sizeable portion of sea level rise is due to thermal expansion. As the oceans continue to warm, they will become less dense, increasing in volume. This will be disastrous for coastal areas, such as New Orleans or Bangladesh, that lie just above or even below the current sea level. Based on the RCP 4.5 scenario, we can expect the average sea level to rise between 0.3 and 0.6 m in the next century. Sea levels will continue to rise long after atmospheric CO₂ levels are kept in check. It is believed that sea level rise alone will create 20 million climate refugees in the coming decades.

Question: Describe two possible social or political problems that may arise as a result of climate refugees.