保护大象的英语宣传语可以是：

1. "Protect Elephants, Preserve Our Planet."

2. "Save the Elephants, Secure Our Future."

3. "Every Elephant Counts, Let's Take Action."

4. "Elephants are Our Guardians, Protect Them for a Better Tomorrow."

5. "Love, Respect, and Preserve: Our Commitment to Elephants."

这些宣传语旨在唤起人们对大象保护的重视，并鼓励采取积极行动来保护这些珍贵的生物。