One way trip to Mars

The title may sound like on of those mainstream science fiction tales storming the internet but this tale is about a love story 300 years from now.The earth 3 centuries from now poisoned with greenhouse gases,flooded with water land barren and lifeless humanity facing its fatal end.Scientists lose hope in saving the earth and plan a one way trip to mars to prevent our human race from going extinct.The story is featuring two teenagers of the 24th century,who plan on going for this mission kissing goodbye to their home the once blue planet which cradled our homosapien race.But little do our young lovers know what this journey has in store for them.On their abode to Mars stuff goes seriously wrong and they face a lot of speed bumps in their journey. Towards the end in a titanic like situation only one of them survives and lives to tell the tale.
P.S. I'm new to this stuff please pardon me if i mess up in between.