In the past, the notion of sustainable investing was merely an afterthought for many investors.

But that mindset is starting to change after the COVID-19 pandemic forced unprecedented lockdowns around the world.

Reduced business activity led to decreased pollution levels and improvements in air quality, resulting in increased attention on environmental issues and sustainable financing.

ESG (environmental, social, governance) funds attracted a record inflow of capital in 2020, with this trend set to continue in 2021.

For investors who want to do good while generating a return with their cash, here are four companies with excellent ESG ratings to consider.

Oversea-Chinese Banking Corp Limited (SGX: O39)

A familiar name to Singaporeans, OCBC Bank is one of the three main banks in Singapore, and the second-largest component of the Straits Times Index (SGX: ^STI).

OCBC is rated “AA” by MSCI’s (NYSE: MSCI) ESG rating system, the second-highest achievable rating.

In its coverage of OCBC, MSCI