Meanwhile, energy giants, including Exxon Mobil and Chevron, have pledged their support for the Paris Agreement. Darren Woods, Exxon's chairman and CEO, wrote in a blog post that the landmark agreement creates "an effective framework for all countries to address rising emissions." But, according to the aforementioned report, both Exxon Mobil and Chevron, along with several other large energy companies, have no set targets to reduce greenhouse gases, enhance energy efficiency or plans to shift to renewables. Oil companies' reporting of their greenhouse gas emissions remains largely voluntary, making it difficult to track independently. All that is part of the reason why despite companies' increased knowledge of climate change issues, there's still a need for shareholder activism, argue some investors.