By “emissions”, the authorities mean CO2, then we are nowhere NEAR any “tipping point”.
Carbon dioxide is ESSENTIAL to life as we know it, and if it were three, or four, or five times its present level, that would not impact negatively on either the mean temperature of our atmosphere and oceans, or in our ability to adapt to its presence.
Too much CO2 causes us to breathe faster, and may have some short-term effects on our body chemistry, but unlike carbon monoxide, is not in the least “poisonous”, else we could not finish a can of Coca-Cola.
As to the effect of CO2 on “global warming”, CO2 is a TRAILING indicator, its percentage of composition in the atmosphere increasing only AFTER the environment has grown measurably warmer. Despite grave warnings not th speak of the sun as the probable source of temperature variations on earth’s surface, the sun is still the major factor in the relative amount of heat retained in the oceans and atmosphere. And the core of earth itself, is a molten mass, with temperatures far too warm to be tolerated by living things that have evolved in the biosphere of this planet. This heat is continually leaking outward to the surface of the planet, sometimes in violent eruptions of magma flow, bur always a steady radiation and conduction through the upper layers of the earth’s crust.
Naturally, all of the foregoing is hypothetical and assumes the GW premise for the sake of discussion. Moreover it is simplistic in that it does not consider contributing factors or their interactions.