The human activity most widely viewed as changing the planet is the burning of fossil fuels. ... to melt, threatening water supplies for hundreds of millions of people. ... and phosphorus to the biosphere than would occur naturally. ... compounds that can remain active in the environment for thousands of years .
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Both Copernicus and Galileo supported the theory of a heliocentric solar system. That means they thought the sun was the center of the solar sytem and all planets revolved around it, while everyone else beleived the Earth was the center of the solar system (geocentric solar system). Both were punished for their views.
A common practice was to pay ridicilously small wages to workers themselves and pay even less to children and women who were working at factories. Another thing that was done was to either import foreign workers who would have to work for even less, or to move production to companies overseas where they would set up a distribution and where workers themselves would also have to work for very small amounts of money. This increased their profit margins.
The medieval guilds were generally one of two types: merchant guilds or craft guilds. Merchant guilds were associations of all or most of the merchants in a particular town or city; these men might be local or long-distance traders, wholesale or retail sellers, and might deal in various categories of goods.
