Approximately what per cent does central america contribute to the total amount of carbon dioxide produced in the world

Food can come from sustainable or unsustainable resources. why has the united nations suggested that bugs could be a better source of food than animals like pigs or cattle?

If the distance between two points on the ground is 10 miles and the distance between the same two points on a map is 4 inches, what is the map scale expressed as a ratio?

What is an additional type of erosion found at the coast? what does it mean?