Final answer:
To decrease the negative effects of climate change, planting more trees and promoting sustainable energy sources like solar and wind energy are the most effective measures.
Step-by-step explanation:
Regarding the measures that can help decrease the negative effects of climate change, the two options that would be most effective are: a) Planting more trees and b) Promoting sustainable energy sources. Planting more trees contributes to carbon sequestration, which means they capture atmospheric carbon dioxide and help reduce greenhouse gases. Promoting sustainable energy sources, such as solar and wind energy, is crucial because it involves transitioning away from fossil fuels, which are significant contributors to carbon emissions. This shift reduces the carbon footprint associated with energy production and helps to mitigate climate change. On the other hand, encouraging deforestation and increasing industrial emissions would have the opposite effect, exacerbating climate change.