In order to fulfill the obligations of the Convention and the Paris Agreement and safeguard humanity, the international community has taken active actions to promote greenhouse gas emission reduction. Various entities, including countries, regions, enterprises, organizations, products, and individuals, have undertaken initiatives to reduction emissions or achieve carbon neutrality at different levels, these efforts have yielded significant progress and tangible results. This chapter will analyze and introduce carbon peaking and carbon neutral practices and cases from different levels. Analysis and presentation of EU and UK carbon neutrality cases, based on the introduction of the main progress of international carbon peaking and carbon neutrality; through the introduction and analysis of the cases of carbon neutrality in enterprises, carbon neutrality in products, carbon neutrality in conference activities and carbon neutrality in individuals, the chapter will elaborate the paths of carbon neutrality at different levels and related inspirations.