In this post I’m not going to talk about the consequences of the climate change, but how hazards impacts can be reduced or mitigated, and also what we do to make them worse.
Even though they have many causes, in a broad way, hazards can termed into:
- Natural or physical- caused by a natural process. Include obvious hazards like earthquakes, landslides, fires, droughts, blizzards, volcanic eruptions, tornadoes, hurricanes and flooding;
- Man-made – created by human negligence, error, or system failure, which includes an array of possibilities that goes from immediate hazards such as dam failure or shipping accidents and global warming, even though it is not believed by scientists called skeptics.
Besides the geological hazards such as earthquakes, volcanoes, peole face other types of natural hazards that result from conditions in the hydrosphere, atmosphere, or biosphere. Flooding, caused by heavy rains, ravage low-lying areas near rivers and streams; coastal erosion eat away at beaches; wildfire threaten life and property in fire-prone areas; tornadoes and hurricanes can cause extensive damage and loss of life.
Even though tose are “natural hazards”, the magnitude of their impacts upon us depend on choices we make. We can make those impacts be worse in various ways:
- Population growth makes people live in areas susceptible to natural disasters;
- Many people choose to live in areas that seem to be attractive but are also prone to hazards. Coastlines are vulnerable to tsunamis and erosion by storms; mountainous areas may feature volcanoes and mass-wasting events;
- Engineer landscapes can increase the frequency or severity of natural hazards. Damming and diking rivers to control floods can lead to floodings; suppressing natural wildfire puts forests at risk of larger fires; mining practices like clear cutting on slopes can induce mass wasting, speed runoff, compact soil and change drainage patterns;
- Earth’s climate changed by emitting greenhouse gases alter patterns of precipitation, increasing risks of drought, fire, flooding, and mudslides locally and regionally. Rising sea levels induced by global warming increase coastal erosion. Some research suggests that warming ocean temperatures may increase the power and duration of hurricanes.
We can also mitigate or reduce the hazards impacts by:
- Using technology, engineering, and policy, informed by a solid understanding of geology and ecology. There are building earthquake-resistant structures;
- Designing early warning systems for tsunamis and volcanoes;
- Conserving coastal forests, reefs and salt marshes protect against tsunamis and coastal erosion;
- Better forestry and mining practices can help prevent landslides;
- Zoning regulations, building codes, and insurance incentives that discourage development in areas prone to landslides, floods, fires and storm surges can keep us out of harm’s way and decrease taxpayer expense cleaning up after natural disasters;
- Mitigating global climate change may help reduce the frequency of natural hazards in many regions.
*Source book: Essential Environment, The Science Behind the Stories, by Jay Withgott and Scott Brennan – 3rd edt.
