The current valuations for oil gas and coal fossil fuel companies, are based on the denial of climate science. This science is accepted by the overwhelming majority of climate scientists.
When it dawns on most people that the science is right and the valuation of these companies becomes based on reality, not on fake news, their value will drop. Possibly, or more likely probably, to zero. It is time for all public sector organisations to divest now from fossil fuels if they want to avoid losses on investments.
The Ransom software that recently knocked out IT systems in the NHS and in organisations across the world can only really succeed because Microsoft already holds us all to ransom. If they provided the source code for their systems, then operating systems like Windows XP could be supported well beyond the date that Microsoft decides to abandon them. Patches could be applied automatically at virtually zero cost making the recent attack impossible. The software wheel does not have to be continually reinvented. Windows XP worked perfectly well for most people and organisations before 2014 when Microsoft decided to make its (much inferior) Windows replacement its primary OS. The operating systems that replaced XP are not significantly better for consumers. Actually arguably they are worse as they include profit maximisation efforts like iTunes and the like which are designed to bring in more revenue, not to enhance the functionality of the systems.