 BOSTON--BUSINESS WIRE--Advent Technologies Holdings, Inc. NASDAQ: ADN Advent or the Company today announced that its two Greek Important Projects of Common European Interest IPCEI have been approved by a joint decision by the Greek Minister of Development and Investments, Mr. Adonis Georgiadis, and the Greek Minister of Environment, Energy, and Climate Change, Mr. Kostas Skrekas. The White Dragon and Green HiPo projects, each of which prominently features Advents innovative fuel 