Ecosystems can be found on a variety of scales such as a small-scale freshwater pond system or on a global scale such as the tropical rainforest biome.

Tropical rainforests are an important ecosystem with distinct characteristics and adaptations. Tropical rainforests face threats which need to be managed to ensure their survival.

Many places around the world are affected by droughts. There are natural and man-made causes of droughts and they have an impact on different places.