The IPCC has been forecasting up to 1150 ppm by the year 2100, and they are a conservative forecaster (climate changes have been following their highest forecas

The IPCC has been forecasting up to 1150 ppm by the year 2100, and they are a conservative forecaster (climate changes have been following their highest forecasts, or even higher). So yes, your grandchildren may well live in a world where the freshest possible outdoor air is such that it makes humans feel sluggish and lethargic, like a stuffy indoor conference room today.