Envisat is the successor of the ERS satellites of the ESA and was built by a consortium from 50 companies under guidance of Astrium. It adds the hitherto most extensive observations of the land masses, oceans, atmosphere and ice caps with its 10 instruments. Envisat helps the scientists to better understand the influence of changes on our climate and among others to provide answers to following questions: Is the ozone hole growing? To what extent are the greenhouse gases collecting in the atmosphere? What is the position of the El-Niño current? What is the condition of the rainforest? How fast are the polar ice caps melting? Envisat was started with an Ariane 5 in March 2002 by European space station Kourou and French Guyana.
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