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Africa 's contribution to global GHG emissions is negligible , with the exception of emissions from South Africa and the countries of Northern Africa , which together account for the majority of the Africa region 's GHG emissions . Burns wrote several poems on the blank leaves , making the volume one of the most desirable of Burns items . War posters in the current exhibit show lithographs drawn directly on the stone ( as in the four French posters by Jonas ) and posters employing offset lithography , first introduced commercially by the American Ira W. We have used both imagination and science as ingredients for generating effective scenarios , and we have made quantitative assumptions across a range of dimensions : eco-nomic growth and struc-ture , popula-tion , technology , resources and the environment . His main objective was to raise money for the poet 's family , and so he felt he must not offend any of the people whom Burns had known or met .