The study was not peer reviewed, but it has attracted a fair
bit of attention anyway, in part because Hansen is known as the godfather of global warming, having first warned Congress of its existence during the sweltering summer of 1988.
You should pay
attention to the specific agent / agency's submission guidelines
anyway, as they will all differ a little
bit, but generally speaking, in the US agents just want to see a query letter plus synopsis, and they will decide whether they want to read a sample
of the actual book based on that.