What will happen if concentration of carbon dioxide increase beyond 360 ppm?

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What will happen if concentration of carbon dioxide increase beyond 360 ppm?

1. All plants will die2. Increase in rate of photosynthesis of C3 plants only3. Increase in rate of photosynthesis of C3 and C4 only4. Increase in rate of photosynthesis of C4 only

What will happen if concentration of carbon dioxide increase beyond 360 ppm?