Emission is related to Pollution. Pollution is the opposite of Conservation. Conservation is related to Law. Law is related to Property. 
Crash is a type of Change. Catch is a type of Change. Catch is a type of Game. Game is a type of Animal. 
Emission <--RelatedTo--> Pollution <--Antonym--> Conservation <--RelatedTo--> Law <--RelatedTo--> Property 
Crash --IsA--> Change <--IsA-- Catch --IsA--> Game --IsA--> Animal 