Helium

After years of endless pollution and global warming, the Earth's temperature has reached unthinkable peaks. Vegetation has taken over roads and buildings and the whole world has grown into a jungle. The few who have survived the war humans have fought against the mysterious creatures know as Ghosts now strive to find a way to escape from the planet as they suffer from hyperthermia and skin burns. Young Alexis leads a group of survivors while trying to avoid the attacks from a rival group of gunmen.