Because it could effect more than just one thing it could effect the whole.
Answer:
Experts believe the significant number of fish washing up on local shores can be attributed to higher than normal temperatures. Water gets warmer and it holds less oxygen so there is less for the fish to breathe.
Fair trade can be observed from different perspectives, depending on the country. The world's strongest economies are flourishing because of that, they can produce much more, and have better quality and lower prices (because of the large quantity they produce), and with fair trade they out compete the companies from the smaller economies. If you look at it from a standing point of a smaller economy, then the poverty is big portion caused by the fair trade, because when a company or farmer produces something, he looks for a certain price for the product, and even though it is a low price, the products from the bigger economies will always have smaller price and pretty much same, if not, better quality, so they lose the battle in the market and thus they their profit, which means they become poorer, and lots of workers lose their jobs or see their wages drop.