What is the main idea of this passage? Answer using a complete sentence.
Chocolate's popularity throughout Europe led to an increased demand for cacao beans. The number of cacao plantations in South America grew,
but then so did the use of slave labor. Today, many chocolate farms are accused of treating their workers unfairly and using practices that damage
the environment. One way to make sure your chocolate is from a company that supports fair working conditions is to visit a website that lists ethical
companies, like Fair Trade Certified. You can also look for a "fair trade" label on the packaging, and visit the brand's website to see if it has
information on its farming and production