Starvation
Famine, Hunger
One person starves and another person starves. Then more people. So much starve that there's starvation going on. It's famine and hunger, everywhere.
きが
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
どうしてそんな風にクッキーを踏みつけたりしたんだ？毎日何千何百人という人が飢餓で亡くなるのを知らないのか。
Why would you step on a cookie like that? Don’t you know that thousands of people die from starvation every day?