I have never read a story called "The Long Journey Through the Wilderness" but I am an avid Bible reader and I study it throughly. The Biblical answer to your question is D. Hope this helps and if you have any other Bible questions, feel free to ask me! :)
Homer tells you in the narrative i think..
Global warming<span> is the term used to describe a gradual increase in the average temperature of the Earth's atmosphere and its oceans, a change that is believed to be permanently changing the Earth's climate.
</span>it effects the world because it causes the see level to rise and the melting of glaciers and ice sheets...
hope this helps!