Time Salvager

4.4 stars.
Such an underrated book. I loved it so much. Maybe I'm biased because I love anything time travel.
The earth is inhabitable and James is basically an agent who goes back in time to retrieve resources and information that might help delay humanity's demise but there is several rules.
1.) You don't do anything to effect the timeline
2.) Do NOT bring someone out of the past
James ends up failing and has to escape his own timeline to escape death