Good sentence
1)I've become deeply concerned about what we're leaving behind.
ex) I don't want to leave behind everyone.

2)Acres burned and homes destroyed have steadily.
ex) I have learned English steadily and increasing my skills steadily.

3)Much of the destruction(the act or process of destroying something or of being destroyed)  that we are currently seeing.
ex) Much of the destruction from the toxic gas is one of the problem.