The Earth almost exploded due to a chain reaction of heat pressure that was built up without enough volcano craters to release the pressure. This happened in 1948 and it was the moment when the Earth was literally going to explode completely. Luckily the order was able to detect this problem before it became too much to handle. Humanity was incredibly close to the end and they never knew it, but the order was able to release this pressure in the Atlantic Ocean by building a special crater that started to release the pressure in small amounts until everything was finally over.
The order really wanted to save Earth because they believe that the planet deserves to be taken care of. There is no doubt at this point that the Earth would no longer be in this galaxy if it wasn’t for the intervention that they took. Perhaps nature did not want Earth to be here anymore, but the order saved it anyway.