GLOBAL WARMING Lina Basto Ximena Contreras

WHAT IS GLOBAL WARMING? CAUSES AND CONSEQUENCES OF GLOBAL WARMING ARGUMENTS IN FAVOR AND AGAINST GLOBAL WARMING HOW HELP TO PREVENT GLOBAL WARMING? CONCLUSION

Throughout its long history, Earth has warmed and cooled time and again.

WHAT IS GLOBAL WARMING? Global warming is the term used to describe a gradual increase in the average temperature of the Earth's atmosphere and its oceans, a change that is believed to be permanently changing the Earth’s climate (NASA)

But climate scientists looking at the data and facts agree the planet is warming. While many view the effects of global warming to be more substantial and more rapidly occurring than others do, the scientific consensus on climatic changes related to global warming is that the average temperature of the Earth

CAUSES OF GLOBAL WARMING ANTHROPOGENIC CAUSES OF GLOBAL WARMING Carbon Dioxide Atmospheric carbon dioxide concentrations have risen by more than 40% since scientists first started recording these levels, from 280 parts per million (ppm) in 1958 to over 400ppm today 2. Methane It is produced when organic matter breaks down and also when ruminants digest their food. 3. Water Vapor water vapor not only acts as a greenhouse gas, it also increases as the atmosphere gets warmer and provides climate changes.

4. Chlorofluorocarbons Chlorofluorocarbons (CFCs) are long-lasting greenhouse gases that also destroy the ozone layer 5. Nitrous oxide It is a potent greenhouse gas that is released primarily by fertilizers used in agriculture and landscaping, but also during the burning of fossil fuels and other organic matter. Source: https://climate.nasa.gov/causes

CONSEQUENCES OF GLOBAL WARMING INCREASE IN AVERAGE TEMPERATURES AND TEMPERATURE EXTREMES The average global temperature has increased by about 1.4 degrees Fahrenheit (0.8 degrees Celsius) over the past 100 years, according to the National Oceanic and Atmospheric Administration (NOAA). 2. EXTREME WEATHER EVENTS While experiencing some of the hottest summers on record, much of the United States also has been experiencing colder than normal winters. Global warming may also lead to extreme weather other than cold or heat extremes. For example, hurricane formations will change

3. ICE MELT One of the most dramatic effects of global warming is the reduction in Arctic sea ice 4. SEA LEVELS AND OCEAN ACIDIFICATION the World Meteorological Organization reported that sea level rise accelerated .12 inches (3 millimeters) per year on average worldwide. This is around double the average annual rise of .07 in (1.6 mm) in the 20th century. 5. PLANTS AND ANIMALS Many species of plants and animals are already moving their range northward or to higher altitudes as a result of warming temperatures, according to a report from the National Academy of Sciences. migratory birds and insects are now arriving in their summer feeding and nesting grounds several days or weeks earlier than they did in the 20th century, according to the EPA. 6. SOCIAL EFFECTS Agricultural systems will likely be dealt a crippling blow because of seasons changes. In addition to less nutritious food, the effect of global warming on human health is also expected to be serious.

GLOBAL WARMING DOES NOT EXIST Mr Trump has suggested he will withdraw the US from the Paris Agreement on climate change

VITAL SINGS GLOBAL WARMING EXISTS This graph illustrates the change in global surface temperature relative to 1951-1980 average temperatures.

Sea level rise is caused primarily by two factors related to global warming: the added water from melting land ice and the expansion of sea water as it warms. The first chart tracks the change in sea level since 1993 as observed by satellites.

HOW HELP TO PREVENT GLOBAL WARMING?

CONCLUSION

REFERENCES http://globalwarming-facts.info/causes-global-warming-human/ https://climate.nasa.gov/causes/ http://list25.com/25-alarming-global-warming-statistics/ http://www.livescience.com/37057-global-warming-effects.html https://climate.nasa.gov/vital-signs/carbon-dioxide/