Beyond the Treeline by Mark Ellis

In the late 21st century, in an unstable world wracked by climate change, brilliant scientist Sean Freeman has the answer – longevity. He knows long life breeds responsibility, for each other and the world.
Working with genius physicist Jess, Sean is convinced he’s going to secure the future of humanity – and maybe find his soulmate in the process.
But there is more to this miracle science than he knows and is being allowed to know. Not least, there are others in the shadows who would see him fail, at any cost. When the answers come, and he learns of Earth’s true purpose, it will take him on an epic voyage of discovery where he will be faced with the ultimate ethical dilemma.