Do you have any examples/options to put there?
<span>Despite his personal opposition to slavery, when President Abraham Lincoln took office in 1861 he insisted that his constitutional duty was to keep the nation together, not to abolish slavery. He conducted the first year of the war with the goal of reuniting the Union, but wartime events, including heavy military losses and the many slaves who escaped behind Union battle lines, forced him to contend with the issue of slavery. He issued a preliminary Emancipation Proclamation on September 22, 1862 and the final version on January 1, 1863, fundamentally changing the meaning of the war.</span>
To make a PPP adjustment for comparing GDP we build a basket of comparable goods and services and look at the prices of that basket in different countries. Purchasing Power Parity is the exchange rate needed for say $100 to buy the same quantity of products in each country.
Well fossil fuels are such a largely used resource in the economy it is hard to transition from it since its so depended on for many things.