According to this scientist from the Lawrence Livermore Labs (use the link below) the powers that be feel that the only remedy we have for the damage done to the ozone layer of the atmousphere and global warming is to continually spray the whole earth with reflective metal particles to deflect the UV rays and and heat rays. All countries participate (voluntarily or involuntarily) and they try to spray all populated areas regularly. You might be safe on an island in the middle of the ocean.
And this is only one of the Chemtrail programs. Most believe there are at least 4.