Could you explain, how will the particles in the atmosphere (like aerosols) influence the amount of sun light reaches the

 Please write one separate paragraph response to each question. (That means you will write 5 paragraphs for 5 questions).

1. Could you explain, how will the particles in the atmosphere (like aerosols) influence the amount of sun light reaches the Earth?

2. Could you describe what contrail is, and how they influence global warming?

3. What can scientists learn about past climate from trees?

4. Based on the findings from ice cores, how do CO2 and CH4 concentrations change with the "comings and goings" of the ice ages?

5. Could you describe some main limitations/challenges for climate models? (Hint: Clouds, aerosols and ocean).