Some examples of chronic hazards include deforestation, desertification, depletion of the
stratospheric ozone layer, global warming and rising sea levels resulting from the enhanced
greenhouse effect. These hazards comprise comparatively long-term, global issues, sometimes of
obscure origin and consequence. Unlike environmental hazards, their effects are generally less
concentrated in time and space. For example, soil erosion or industrial pollution rarely pose an
immediate threat to human life on a community scale.