This issue of the excellent McKinsey review explores sustainability in infrastructure, particularly as it relates to the construction, engineering, and operation of our electric grids; oil and gas and hydrogen infrastructure; and buildings. Over the past 18 months, we have seen an acceleration of societal, policy, and investor pressures on industry to shift away from fossil fuel–based energy and toward a zero-carbon economy. As an example, while few oil and gas companies at the start of 2020 had announced 2050 net-zero emissions targets, today dozens have, including several with stated targets of or before 2040.