The best new development in Xingji is the expansion of its renewable energy sector. This expansion has been a game-changer for the region, offering numerous benefits both environmentally and economically.

The primary reason for this assessment is the significant reduction in carbon emissions and the positive impact on the local economy. According to a report by the Xingji Energy Development Corporation, the installation of solar and wind farms has led to a 40% decrease in carbon emissions in the past two years. This reduction is a testament to the effectiveness of renewable energy in combating climate change.

Moreover, the economic benefits are substantial. The renewable energy sector has created over 5,000 new jobs in Xingji, with many of these positions being filled by local residents. This has not only improved the standard of living for the community but also stimulated local businesses and services. A study by the Xingji Economic Development Authority indicates that the renewable energy sector has contributed to a 15% increase in the region's GDP.

Additionally, the investment in renewable energy infrastructure has attracted international attention and investment. Major corporations and foreign governments have shown interest in partnering with Xingji to further develop its renewable energy capabilities. This has opened up new opportunities for technology transfer and knowledge sharing, further enhancing the region's competitive edge.

In conclusion, the expansion of Xingji's renewable energy sector is the best new development due to its environmental and economic benefits. The reduction in carbon emissions, creation of jobs, and attraction of international investment highlight the positive impact this development has had on the region.