for better research go to under NOAA - Climate.gov
This is a short paraphrased summary of the article about ice cores in that website.
Answer: Researchers in labs may melt or crush bits of the ice core a little at a time, each deeper layer shows the time in the Earth's climate history. Tiny pieces of pollution, metals, radoiactive fallout, pebbles, sea salt, volcanic ash and even air bubbles all present important information that researchers can look for to track changes in the atmosphere's composition and temperature.
Human rights because it doesn’t say who specifically this activist is fighting for.
<em><u>Venezuela is the major producer for oil.</u></em>
Just in case you need to know how much they produced.
In 2006 they produced- 2,511 of oil.
In 2007 they produced- 2,433
In 2008 - 2,394
In 2009- 2,239
In 2010- 2,146
In 2011- 2,240
