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North America has experienced a number of long-lasting droughts with significant effects. A lack of water in stores such as rivers, lakes, reservoirs and aquifers (water stored underground naturally) can lead to drought. 0000218896 00000 n The desertification of theSahelin North Africa is partly blamed on a prolonged drought whose effects were intensified by farming practices that result in overgrazing. Juniper trees can self-pruneby steering water only toward the branches required for survival. Plant and animal life are similarly affected. Federal assistance programs were able to help many farmers, but a longer-lasting drought would make it more difficult for the government to provide nationwide aid. Answer: a drought can be caused by either rising hot temperature or the sun making the weather even more hot, humans can do the same and we can reduce it by planting more trees and use renewable energy as coal, gas, and oil energy plants can have an effect on our ozone layer and can make climate change even harder for us to survive But increasingly they are caused by human activity. The combination of lack of rain, high temperatures, and strong winds affected at least 50 million acres of land. In Yellowstone National Park 36 percent of the park was destroyed by fire. This can also increase the risk for acute respiratory infections like bronchitis and bacterial pneumonia. Privacy Policy . How can droughts be triggered by physical (natural) condition? A Warner Bros. All the water we ever had we have today and it is stored in the air or on land. Surface water quickly evaporates in warm, dry conditions leading to an increased risk of drought. This then requires an adjustment in the way we deal with drought conditions, how we monitor and forecast these extremes, and how we consume water in general. Information from the Standardized Precipitation Index (SPI) is often used to supplement the PDSI data. Perth has been dealing with a decline in rainfall since the mid 1970s.