It is absolutely not impossible to transition away from fossil fuels without suffering.

Fossil fuels aren't risk-free. Even if you don't care about CO2, fossil fuels are extremely inefficient in the long run because they're not renewable. Once you extract them and burn them, they're gone, forever. This IS NOT the case with renewable energy, which means that, as time goes on, renewables will be much cheaper than fossil fuels. Already, today, solar is much cheaper than petroleum per unit of energy.

In addition, every country on Earth can make use of renewables. Most countries cannot use fossil fuels directly, because they don't have them. This means they expose themselves to geopolitical risk. Exhibit A: this.

If the transition is done slowly, you end up saving money, not losing it. That means less suffering, not more.