Yes, Latin America is very dangerous for environmentalists because in 2015 there were 185 recorded deaths of environmental activists. Criminal organizations are murdering environmentalists who speak out against their actions. This ensures that others won't speak up and it also makes their job of destroying wildlife and ecosystems much easier.
Yes, Latin America is dangerous for environmentalists because most environmentalists that are murdered are from Latin America. Criminal gangs murder these environmental activists to silence their voices and prevent them speaking out against destroying the environment for profit. In 2015, 185 environmentalists were murdered for speaking out against different corporations.
Latin America is dangerous for environmentalists because the governments of these countries do not place focus on environmental health, awareness, or conservation. Environmentalists attempting to work or campaign in these countries will find themselves facing opposition from the current law-making powers. Additionally, the general populations of Latin America are more concerned with political corruption and lower standards of living to dedicate the necessary attention to environmental causes.
There are dangers in all areas, but I don't think that Latin America is any more dangerous for environmentalists than any other area of the world. Some areas of Latin America are dealing with Zika, but it is not at epidemic levels yet. Environmentalists will stay safe as long as they use caution.