Humanity is facing an inequality crisis that could mean the emergence of the first trillionaires, while almost half the world’s population is stuck in poverty, warns a letter by 40 former prime ministers and presidents. The letter is an appeal to current leaders to address rising threats of poverty, disparity and environmental breakdown, reported The Guardian. “Together, we call for a new economic coalition of the willing of countries to cooperate – to combat extreme inequality, end poverty and meet human rights. One that is founded upon values of solidarity and sovereignty,” the letter states.