You're outer category delusional.
The projected sea level rise is up to about a meter by the year 2100. Not in the form of a sudden tidal wave arriving next tuesday, but a few milimeters per decade.
Think of the world 100 years ago. Think how different agriculture was then, how different cities were. A century is a very long time on the scale of a human life and culture.
Let's adapt to a potentially global and humankind-annihiliating catastrophy once the methane under ice in Siberia starts to melt and gets released to the atmosphere. It's already bubbling out, you can see it with your eyes.
Earth will go on, some life possibly will also go on but humans are facing the business end of a shotgun at the moment.
You're harming your cause with such extreme and patently ridiculous alarmism. Did you know that up to the start of the Pleistocene, there were no permanent ice caps on either pole? Was the earth in the Pliocene an uninhabitable wasteland? We are living in the Holocene interglacial stage of an ice age today. Today's climate isn't the norm, it isn't the only climate in which life is possible. In fact, every species alive today, except for perhaps a handful of human domesticated crops, already existed during the last ice age, and lived through the transition. Before you bring up the standard response about the rate of climate change being completely unique in the history of the earth, this too is false. The transition from the last glacial to the Holocene interglacial was just as sudden. Vast subarctic tundras, built up over a period of 100,000 years (the duration of the last glaciation) thawed and became exposed (in fact, some of it is still frozen deep under the surface in central Europe!).
The environment is facing a number of terrible human induced crises - primarily habitat loss, over-fishing, and pollution. Yes, many species will disappear by the end of the century, even if the climate stops changing today, even if the climate goes back to the way it was before the industrial revolution. If you live long enough, you will find that a slight increase in temperature will have been a minor influence compared to these things.