A cure for polio... FDR created many new jobs with the CCC (Civilian Conservation Corps). They built bridges, cut down trees, etc.
D - all of the above.
All, governmental people, businesses, as well as citizens should do their part to improve and participate in conservation efforts. This can be done on different levels through different resources. Without everyone doing their part, it will be extremely hard to achieve anything :)
temples
hope it's correct and really helps...!!