Ukraine peace talks: What are the major issues remaining as Zelenskyy prepares to meet Trump?

Volodymyr Zelenskyy has said the 20-point plan to be discussed "is about 90% ready" and that "a lot can be decided before the ...

Peak Oil: Why the world can't break its fossil fuel habit

Climate change shifted the oil production debate from scarcity to demand. But without delivering on ambitious green pledges, ...