2. Pan right of the Iztaccihuatl volcano, which is said to have the form of a sleeping woman
3. Wide shot of the town of Amecameca, with the Popocatepetl volcano in the background
4. Close shot of the sign outside the offices of the Izta-Popo National Park, which contains both the Iztaccihuatl and Popocatepetl volcanoes
5. Medium shot of Agustin Tagle, the park's assistant director, at his desk
6. Medium shot of Tagle leaving the office
7. SOUNDBITE (Spanish) Agustin Tagle, assistant director of the Izta-Popo National Park:
"We have seen most of all that the quantity of snow in the autumn has decreased, and that's the worrying part because, well, a glacier can only maintain itself or grow based on the snow that falls. If you don't have snow, the glacier stops growing. And if that happens while there is a high temperature in the region, high compared to the usual temperature, what we have is that the glaciers will start to shrink."
8. Wide shot of Popocatepetl, corn fields in the foreground
9. Wide shot of ice on Popocatepetl
13. SOUNDBITE (Spanish) Alejandro Lopez, Director of the Izta-Popo National Park:
"So here, it's a meeting of two large biomes, the neo-arctic and the tropical, that create conditions of climate and biodiversity or that permit a larger biodiversity, additionally they are in different altitudinal layers, that permit different types of vegetal associations and different types of ecosystems."
14. Wide shot of the Iztaccihuatl volcano with clouds blowing over it (in the foreground is the former hotel near the peak of Popocatepetl that had to be shut down when the volcano regained activity in the 1990s )
15. Wide shot of the view toward Puebla (city)
16. SOUNDBITE (Spanish) Alejandro Lopez, Director of the Izta-Popo National Park:
"From the environmental point of view, it's vital. Let's say that this area is the lung, is what cleans the atmosphere and the valleys of Mexico and Puebla, which are two of the most populated in the country. They provide them with water, they provide them with biodiversity, they provide them with oxygen, and with the beauty of this place."
17. Wide shot of view toward Iztaccihuatl
18. Wide shot of Iztaccihuatl peak
19. Wide shot of Iztaccihuatl peak
20. Wide shot of surrounding countryside
21. Pan right of green area that is being reforested
22. Wide shot of workers loading beetle-infested logs to be removed from the park
Mexico may be better known for its tropical beaches, but this ecologically diverse country also boasts elegant, snowcapped mountain peaks and sprawling glaciers.
However, scientists say that a combination of global climate change and local environmental factors are changing snowfall patterns and leaving the glaciers in Mexico's central highlands without the precipitation (snowfall) they need to survive.
At the Izta-Popo National Park south of Mexico City, park officials, scientists and visitors have noticed a dramatic change in the size of local glaciers in the last few decades.
Agustin Tagle, assistant director of the Izta-Popo National Park, says the autumn snow fall has decreased, leading to a reduction in the size of the glaciers.
Local people talk of shorter more intense rainy seasons, shorter milder winters with brief very cold spells, whereas before winter was long but consistently mild.
The ice sheets are found atop two major volcanoes, Iztaccihuatl, known Sleeping Woman because she resembles a woman sleeping on her back, and Popocatepetl, which means Smoking Mountain in the indigenous language of Nahuatl.
Legend has passed down various versions of the volcanoes' origin -- a love story of an Aztec princess, Izta, and the warrior Popoca, who was said to have died in battle.
Izta died of sadness, but Popoca later returned alive, committing suicide after learning of his lover's death.
The gods covered both with snow and made volcanoes of their bodies.
Alejandro Lopez, the Director of the Izta-Popo National Park says the region is comprised of two distinct environmental regions " the neo-arctic and the tropical", creating a large range of biodiversity and ecosystems.
Lopez says the environmental importance to the volcanoes to this area of Mexico is vital, providing much needed water to the nearby cities of Mexico and Puebla.
Popocatepetl, Mexico's second highest peak at 5,452 metres (3.4 miles), has one major glacier, but as the volcano has been active since the 1990s and is no longer a good measure of evidence of climate melt because of volcanic warmth.
But Iztaccihuatl is 5280 metres (3.2 miles) high and is still dormant and covered by her "dress" of snow, with glaciers on what are known as her "chest" and "belly"..... but over the years her "dress" has thinned.
The size of glaciers isn't generally measured in length, since it varies with snowfall that isn't necessarily part of the glacier.
They are measured in depth instead - the largest glaciers on Iztaccihuatl are about 80 meters (262 feet) thick and in the past 15 years have reduced by 20-30 meters according to the park's own measurements, but the thickness and reduction varies on different parts of the mountain.
Park officials point to a variety of linked factors causing the current melting - change in rainfall patterns, deforestation, and rising temperatures that could be the combined result of global warming and the natural climate cycle.
They are working with local communities to provide income alternatives to illegal logging and have embarked on major reforestation programmes to preserve local rainfall cycles.
The scientists are looking to Iztaccihuatl for a measure of how Mexican glaciers are faring in the age of human-generated climate change.
Radar studies have shown that one glacier on Iztaccihuatl has lost more than half of its depth in the last ten years, and it's continuing to lose mass.
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