There can be two kinds of disasters Natural Disaster –naturally occurring physical phenomena caused either by onset events which can be geophysical (earthquakes, landslides, tsunamis activity) hydrological (avalanches and floods), climatologically (extreme drought and wildfires), meteorological (cyclones and storms/wave surges)
(disease epidemics and insect/animal plagues).
rapid or slow and volcanic temperatures, or biological
Technological or Manmade Disasters - are events that are caused by humans and occur in or close to human settlements. This can include environmental degradation, pollution and accidents. Technological or man-made hazards (complex emergencies/conflicts, famine, displaced populations, industrial accidents and transport accidents).
Of late there are also a third category of disasters that is emerging. These are natural disasters which are manmade. Due to the growing industrialisation and urbanisation, the ecosystem is being largely disturbed. It is affecting the balance in the ecosystem and hence it leads to the natural disasters. For example, the increasing frequency of calamitous droughts that has been observed globally over the past 60 years can be easily predicted by taking into account the human economy’s emissions of greenhouse gases and other dangerous gases.
Thus humans also contribute to the development of droughts through inappropriate land use policies, and in some other ways which causes disturbances in the environment. As the atmosphere warms, as a result of global warming, more intense rainfall is expected to trigger even more landslides. This can be seen in the recent Uttarakhand