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Global warming is a great [danger|possibility|opportunity]. On the one hand, lots of problems come from nature itself: volcanic [explosions|avalanches|eruptions], gas emission because of the ocean "breathing", solar activity changes, etc. But on the other hand, human beings also have their negative impact: burning coal, pumping out oil and gas. As a result, the landscape has been changing a lot over the last hundred years. The problem has been getting worse because of [growing|chopping|cutting down] trees for [clearing|cleaning|peeling] the space for new buildings: office skyscrapers, houses and shopping centres.

Why is global warming so dangerous? The oceans and seas are getting warmer, so ice caps are [melting|sliding|rising]. As a result, the level of water is changing, and people are suffering from floods. Droughts prevent people from growing crops and can definitely lead to [war|famine|homelessness].

Increasing CO₂ (carbon dioxide) concentration in the atmosphere causes the greenhouse [affect|effect|impact], which has a lot of consequences too. Firstly, it can lead to holes in the ozone [background|level|layer], which are a great [cause|source|basis] of radiation, harmful and dangerous for human beings. Secondly, uncontrolled [weather|forecast|climate] change can destroy the fauna balance. Plenty of animals and plants could become [extinct|endangered|died] forever.

Both flora and fauna are in danger, and only people are able to stop the catastrophe.