Global Warming is a continuous rise in global mean temperature mainly caused by the increasing concentration of green house gases (GHG's) arising from human activity. For more information on global warming:  http://yosemite.epa.gov/OAR/globalwarming.nsf/content/index.html

Floods refer to an overflow of the water which occurs during heavy rainstorms, when the runoff is concentrated very  quickly into the streams. It also occurs due to rapid melting of snow. Due to increased compacting of the surface, rainfall may not infiltrate into the soil, leading to rapid build up of water, and flooding in urban and settled areas.

Landslides are movement of material which take place due to instability on slopes, as a result of gravity. Landslides are a common form of slope erosion in areas of stream incision and tectonic uplift. Landslides are responsible for forming the initial slope upon which other processes can then operate.

Man-made or Anthropogenic Climate Change refers to climate change which is attributed to human activities both deliberate and inadvertent. These activities include farming and urbanization.

Natural Climate Change refers to climate change which occurs on its own and is related to the flows of energy into and out of the earth-atmosphere system and the ways in which energy is budgeted within the earth-ocean-atmosphere systems.

Sand storms are a processes common in arid environments and occur when the wind force removes the loose sand from the dry surface by suspension and saltation. The sand can be moved to great heights and long distances reducing the visibility and causing a health hazard.