The main cause was the assassination of Franz Ferdinand who was the archduke of Austria. He was assassinated by Gavriollo Princip who was Austrian - Hungarian. Those two countries were constantly in conflict because Hungary wanted to separate and once those countries went into war over the assassination their allies had to join being the rest of Europe. <span />
The warming of the Earth due to buildup of carbon dioxide and other gases that help trap energy is termed the greenhouse effect.
Because the exchange of incoming and outgoing radiation that warms the earth because heat trapped is close to Earth's surface by “greenhouse gases.” These heat-trapping gases can be thought of as a blanket wrapped around Earth, keeping the planet toastier than it would be without them.
Green house gases:
1) Carbon dioxide (CO2)
2) Methane (CH4)
3) Nitrous oxide (N2O)
4) Industrial gases:
a) Hydrofluorocarbons (HFCs)
b) Perfluorocarbons (PFCs)
c) Sulfur hexafluoride (SF6)
d) Nitrogen trifluoride (NF3)
The concentration of greenhouse gases is increasing in large part because of the combustion of fossil fuels. Key sources of chlorofluorocarbons are solvents, refrigerants, and propellants.
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