  Global warming due to human-made gases, mainly CO2, is already 0.8{\deg}C and
deleterious climate impacts are growing worldwide. More warming is 'in the
pipeline' because Earth is out of energy balance, with absorbed solar energy
exceeding planetary heat radiation. Maintaining a climate that resembles the
Holocene, the world of stable shorelines in which civilization developed,
requires rapidly reducing fossil fuel CO2 emissions. Such a scenario is
economically sensible and has multiple benefits for humanity and other species.
Yet fossil fuel extraction is expanding, including highly carbon-intensive
sources that can push the climate system beyond tipping points such that
amplifying feedbacks drive further climate change that is practically out of
humanity's control. This situation raises profound moral issues as young
people, future generations, and nature, with no possibility of protecting their
future well-being, will bear the principal consequences of actions and
inactions of today's adults.
