Declaration: a declaration is a document saying that something is true, or that someone will try to do something. Once the document is written, people sign it if they agree with it.
Biodiversity: biodiversity refers to the variety of plants and animals that we have living in our environment. If there are many different plants and animals, then we have good biodiversity.
Crisis: a crisis is a problem.
Responsibility: a responsibility is a duty.
New Zealand has joined the Sharm El-Sheikh Declaration this week.