Mexico's Energy
Mexico uses different energy sources and has the potential for a lot of bio energies like wind, solar and biomass energy. But Mexico uses mainly natural gas, petroleum and coal. Mexico is among the top oil producers and exporters in the world and has the third greatest geothermal energy production. Mexico is also home to the largest geothermal power stations in the world. But Mexico's main energy source is petroleum with 56 % , natural gas at 29% and coal at just 5%.
Glacial Retreat
A glacier is a body of snow and ice that moves. They respond the precipitation and temperature so temperature and precipitation is the most important parameters to study climate change. They are the most visible indicators of climate change and the climate controls the glaciers behavior. They respond in terms of glacial length, mass balance and runoff. These are the direct indicators of the change in climate. The indirect changes include the advance and retreat of the glacier but is still a good signal for climate change. Climate change causes a variation in the amount of snow and ice lost by melting. 
The Himalayas are the youngest and the highest mountains in the world and have the largest concentration of glaciers outside the polar caps. The glaciers feed the rivers of Asia and play a very large role in the metro logical condition in India. It has been confirmed that the northwest Himalayan region has warmed up at a much faster rate than the global average with a rise of 1.6 degrees Celsius from 1901-2002. Also there has been a decreasing trend in snowfall from 1989-2008. this will impact the amount of water that the glaciers will release to the rivers which in many parts of Asia is the main water source and this will lead to the ruin of crops and cattle. Agriculture that is effected by the water loss will have a negative impact on the economy.
In Antarctic Marine sediment cores show that ice shelves probably have not reached a similar minimum in at least 10,000 years. Climate change will have many other impacts on Antarctica. The retreat of coastal ice and loss of snow cover would result in newly exposed rock and permafrost providing new habitats for colonization by expanding and invading flora and fauna. But this might lead to invasion of non native species especially if introduced by human and could kill native species. There have been changes in all parts in the marine ecosystem in the west of the arctic peninsula. The reduced sea ice cover has created an imbalance in the population of krill and salps, the main eater of plankton. This will effect larger species like seals, penguins and whales whose populations have already declined a lot. This also effects the CO2 secretion in the southern ocean. Because of the loss in the population in large species there will be higher competition for fishermen to make money and could eventually lose their jobs.
Glacier National Park will be deeply effected by the loss of glaciers. The mountain snow packs hold less water and glacier water acts as a water bank by storing water and feeding creeks and rivers through out the dry season but snow fall melts faster and so the ice melts two weeks earlier in the spring. This impact the regions water supplies, wildlife, agriculture and fire management. There will be a loss in alpine meadows and will put high elevation species at risk of diminishing. With less water from the glaciers and the higher temperatures there will be higher risks of forest fires and will have a very negative impact on the tourism and could impact the regional air quality and increase the number of hot days. 
The Impact on Tourism
Glacial retreat will have a bad impact on tourism in places with glaciers. In Glacier National Park tourism brings in 1 billion dollars annually because people want to see the glaciers and even if there is no glacier in that spot people can see what the glaciers make like snow caped mountains, waterfalls, lakes, wildflowers, alpine meadows, wildlife and the turquoise colour in Crater lake. But the blue in the lake is quickly fading because the colour is made by "glacier flour" which is finely ground rock powder made by glacier movements. But if the glaciers are completely gone so will the colour. A survey was given to tourists based on if they would visit if glacier park looked like it will in a century and 20% said that they would not visit at all and 40% said they would visit less often. In 2003 when wild fires burned across 10% of the glacier visitation fell by half and in august alone 258000 fewer people visited then in previous years. Overall, tourism will be greatly impacted in areas with glaciers because tourist what to see glaciers and what they make but when they are gone so are the tourists.
Glaciers in Mexico are melting fast. It is estimated that the glaciers of Iztaccihuatl, Orizaba's peak and Popocatepetl will disappear in the next 10 to 35 years and the glaciers are melting faster then they were predicted to.
Land Use and Agriculture in Mexico
Mexico uses only 8% of its land on houses, 11% on grazing and 7 % for firewood. Most of Mexico's land use goes to agriculture 74%. Growing crops is a very important aspect of mexico s agriculture, accounting foe fifty percent of agricultural out put. The main crops include corn, sugar cane, tomatoes, wheat, sorghum, lemons, limes, mangoes, avocados, oranges, beans and coffee. Mexico mainly used slash and burn agriculture for hundreds of years but recently the government has banned slash and burn agriculture so Mexicans are slowly turning toward more modern types of agriculture like mono culture especially economically successful crops like corn, tomatoes and coffee.
Mono culture
Pros
- reduced plant competition for nutrients, space and solar radiation
- control of unprofitable organisms
-maximize profit from growing economically successful crops
-cheaper for mechanized labor
-market driven
-cheap production
CONS
- Nutrient loss, after many times of the same crop fields may gradually lose their fertility. The result may be desertification, a situation in which land is infertile and unable to support growth of any kind.
-diseases-no genetic variance between plants
-reliance on fossil fuels, chemicals and technology
-environmental damage
- displacement of local crops
Poly Culture
Pros
-major crop failure unlikely due to genetic variance
-rotation of crops replaces nitrogen in soil
- pesticides and fertilizers not as necessary as different plant species and animals perform these functions
- multiple crops and markets
-short, medium and long term crops grown
Cons
-more knowledge intensive
-more difficult to mechanize and there fore much more expensive.
-Erosion, when fields are used next to each other in rapid succession, roots and temporary water shortages are lost and unable to prevent nutrients from leaving the area permanently.
Slash and Burn
Is the agricultural technique which involves cutting and burning of forests right before the rainy season to create fields. It is more common in tropical areas.
Pros
-proven more sustainable and about as productive as more modern energy intensive agricultural methods.
Cons
- deforestation- when practiced by a lot of people there is temporary or permanent loss of forest cover
- the ash of the trees that were burned return lots of nutrients to the soil
-crop off cuts are recycled on site so decomposition can occur returning nutrients to the soil
-cheaper to burn debris on site than mulch or to remove the debris off site
- biodiversity loss, when plots of land area are cleared the various plants and animals that lived there are gone. If a particular area is the only one that holds a particular species this could result in extinction.
- After the fire there is a spike in nutrients in soil but if no utilized the nutrients may leach and therefore reduce fertility of the soil.
- fires are risky and they may go out of control and cause damage and endanger lives and animals.
