"ESG stands for environmental, social and governance. These are called pillars in ESG frameworks and represent the 3 main topic areas that companies are expected to report in. The goal of ESG is to capture all the non-financial risks and opportunities inherent to a company's day to day activities." From Deloitte's ESG Explained Series, #1 What is ESG?
Environmental issues can include:
Social issues can include:
Governance issues can include:
Other names for ESG investing: sustainable investing, responsible investing, impact investing, socially responsible investing (SRI)
See Falvey's ESG guide for additional news sources including specific ESG journals and reporters.

ESG Considerations for Asset Managers – The Emerging Regulatory Framework Applying to Investment Funds and Investment Advisers
ESG: What It Means for Boards, Management, and Counsel
Climate Change, Sustainable Investments, and Social Governance: Law and Compliance