(Reuters) - Climate change has a serious impact on all kinds of crops, including grapes, but one Portuguese wine family is trying to save some of the country's seldom-used varieties from global warming. Portugal has about 258 indigenous varieties of grapes but many are no longer used to make wine. Joao Roquette, the chief executive of Esporao, SA, the largest wine producer in the country's Alenjto region, and his Australian winemaker David Baverstock have selected about 188 varietals and are planting them in an experimental vineyard to make sure they survive.