Grasslands are areas dominated by grasses that cover 40% of the Earth's surface. A grassland ecosystem consists of primarily grasses as well as animals and microorganisms. The two main types are tropical grasslands near the equator and temperate grasslands at higher latitudes. Tropical grasslands have taller, coarser grasses and scattered trees while temperate grasslands have shorter, softer grasses. Grasslands support a variety of plant and animal life as producers, primary consumers, and higher-level consumers and decomposers. Threats include conversion to agriculture, urban development, and climate change, so conservation efforts focus on education, wetland protection, crop rotation, and controlled burning.