Let me start with a rather monumental report published by the International Energy Agency: Net Zero by 2050 A Roadmap for the Global Energy Sector There are 400 milestones to get there from here.   For success, the world will need to fully commit.  Hasn't happened yet. Most state or national efforts of this sort usually only address electricity.  This will be the easy part, for wind and solar options are well developed, with storage being the primary, and serious, concern. What about aviation?   Nothing much is ongoing today to address this matter.   There is some mumbling about jet fuel from biomass, but every major attempt has failed to be economically competitive.   Part of the difficulty has been the  collapse of oil prices , which were above $100/barrel for a while from 2010 to 2015, but has since then largely been below that level, more recently at around $80/barrel. So for nostalgic Tuesday, let me go back to my posting of 20June2011 on  JETFUEL FROM MACROALGAL PLANTATIONS .

  From  Worldometer  (new  COVID-19 deaths yesterday):          DAY    USA    WORLD     Brazil      India      South Africa June     9    1093     4732        1185        246        82 July    22     1205     7128        1293      1120       572 Aug    12     1504     6556        1242       835       130 Sept     9     1208      6222       1136      1168        82 Oct     21     1225      6849         571       703        85 Nov    25     2304    12025        620       518      118 Dec     30     3880    14748      1224       299      465 Jan      14       4142    15512       1151         189      712                            20      4385    17350      1382        152     566             28       3908   16388      1439       162     555   Feb      1       1904     9265        609         94     235             2       3632   14673       1240        113      547 Summary:  There is a definite decline in new deaths from last week.  However, whenever large numbers of people gather togeth