Earth's capability to sustain life within the next millenium...

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The world is changing. Changes are brought by earth itself and by man's actions. With great effects of man's actions to the environment, may it be good or bad, I am always thinking if after I die, how many more years can earth be able to sustain life? Its like would it ran out of fossil fuels, ozone layer totally depleted, evolution of different species or extinction?? I have also checked my life's footprints on a worldometer, its like I would need 1.5 earth to live on. Would the earth be habitable for another millennium?