why should be people living in developed countries be as concerned as people living in developing countries about climate change

Developed countries have contributed 80% of the global warming as compared to the developing nations.

Explanation:

Climate and global warming are a global phenomenon and affect each and every nation differently, the rise of the surface temperature and rose of the sea levels all around the world impacts the settlements along the coasts. The increase of the greenhouse effects has led to the increase of the oceans becoming a carbon sink.  The impact of climate change is felt in developed nations in the form of heatwaves, extreme weather patterns, and submergence of the coastland lands. Every year billions of dollars are wasted on food and water supplies.  As of 2030 estimated global warming is expected to kill 250,000 people form malnutrition, malaria, diarrhea, and heat stress.

No it is an oblate spheroid apparently

Magma is outside the volcano  and lava is inside the volcano.