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I believe a motif can contribute to, or become a theme when it gathers larger significance throughout a text. A theme is what you generally write about in a literary piece, so if you develop a metaphor further, it may come to denote a theme of a work.
Include important facts and details about global warming
Research all there is to know about climate change
research how climate change is contributing to the earth
A lion represents strength, power, and royalty. Many rulers over many centuries have used lions as an animal of pride. Babylon was an especially good kingdom that used them and even used them in executions to make the people fear them. A lion is a predator and so it makes the kingdom seem strong willed and dangerous as well as somehow holy. England used the lion as a symbol of Christ and just like the Greeks put Medusas' head on their soldiers' shields, England put the lion on the coat of arms as a symbol of protection, might, and yet again, royalty and a symbol of fear to a warring country.