What kind of thinking does this sentence display Tourism is one the biggest threats to coral reefs so we need plan our visit tour before they are destroyed?

The sentence displays wishful thinking. The speaker is expressing a desire for something to happen even though there is no evidence that it will. In this case, the speaker wants tourism to be stopped before coral reefs are destroyed, but there is no guarantee that this will happen. The speaker is also assuming that tourism is the only threat to coral reefs, when in fact there are many other factors that contribute to their destruction, such as pollution and climate change.