diff --git a/include/sora/sora_client_context.h b/include/sora/sora_client_context.h
index d8a21e4..bfa2dc3 100644
--- a/include/sora/sora_client_context.h
+++ b/include/sora/sora_client_context.h
@@ -2,7 +2,6 @@
 #define SORA_SORA_CLIENT_CONTEXT_H_
 
 // WebRTC
-#include <api/environment/environment_factory.h>
 #include <api/peer_connection_interface.h>
 #include <media/engine/webrtc_media_engine.h>
 #include <pc/connection_context.h>
diff --git a/include/sora/sora_video_decoder_factory.h b/include/sora/sora_video_decoder_factory.h
index 6b8a356..2ba98fe 100644
--- a/include/sora/sora_video_decoder_factory.h
+++ b/include/sora/sora_video_decoder_factory.h
@@ -5,7 +5,7 @@
 #include <vector>
 
 // WebRTC
-#include <api/environment/environment_factory.h>
+#include <api/environment/environment.h>
 #include <api/video/video_codec_type.h>
 #include <api/video_codecs/video_decoder_factory.h>
 
@@ -65,7 +65,7 @@ class SoraVideoDecoderFactory : public webrtc::VideoDecoderFactory {
 // ハードウェアデコーダを出来るだけ使おうとして、見つからなければソフトウェアデコーダを使う設定を返す
 SoraVideoDecoderFactoryConfig GetDefaultVideoDecoderFactoryConfig(
     std::shared_ptr<CudaContext> cuda_context = nullptr,
-    void* jni_env = nullptr);
+    void* env = nullptr);
 // ソフトウェアデコーダのみを使う設定を返す
 SoraVideoDecoderFactoryConfig GetSoftwareOnlyVideoDecoderFactoryConfig();
 
diff --git a/src/sora_client_context.cpp b/src/sora_client_context.cpp
index ba68f01..d91bfc8 100644
--- a/src/sora_client_context.cpp
+++ b/src/sora_client_context.cpp
@@ -5,6 +5,7 @@
 #include <api/audio_codecs/builtin_audio_encoder_factory.h>
 #include <api/create_peerconnection_factory.h>
 #include <api/enable_media.h>
+#include <api/environment/environment_factory.h>
 #include <api/rtc_event_log/rtc_event_log_factory.h>
 #include <api/task_queue/default_task_queue_factory.h>
 #include <call/call_config.h>
@@ -62,7 +63,7 @@ std::shared_ptr<SoraClientContext> SoraClientContext::Create(
       absl::make_unique<webrtc::RtcEventLogFactory>(
           dependencies.task_queue_factory.get());
 
-  void* jni_env = sora::GetJNIEnv();
+  void* env = sora::GetJNIEnv();
 
   dependencies.adm = c->worker_thread_->BlockingCall([&] {
     sora::AudioDeviceModuleConfig config;
@@ -91,7 +92,7 @@ std::shared_ptr<SoraClientContext> SoraClientContext::Create(
   {
     auto config = c->config_.use_hardware_encoder
                       ? sora::GetDefaultVideoEncoderFactoryConfig(
-                            cuda_context, jni_env, c->config_.openh264)
+                            cuda_context, env, c->config_.openh264)
                       : sora::GetSoftwareOnlyVideoEncoderFactoryConfig(
                             c->config_.openh264);
     config.use_simulcast_adapter = true;
@@ -103,7 +104,7 @@ std::shared_ptr<SoraClientContext> SoraClientContext::Create(
   {
     auto config =
         c->config_.use_hardware_encoder
-            ? sora::GetDefaultVideoDecoderFactoryConfig(cuda_context, jni_env)
+            ? sora::GetDefaultVideoDecoderFactoryConfig(cuda_context, env)
             : sora::GetSoftwareOnlyVideoDecoderFactoryConfig();
     dependencies.video_decoder_factory =
         absl::make_unique<sora::SoraVideoDecoderFactory>(std::move(config));
diff --git a/src/sora_video_decoder_factory.cpp b/src/sora_video_decoder_factory.cpp
index b944656..9c83b6a 100644
--- a/src/sora_video_decoder_factory.cpp
+++ b/src/sora_video_decoder_factory.cpp
@@ -2,7 +2,7 @@
 
 // WebRTC
 #include <absl/strings/match.h>
-#include <api/environment/environment.h>
+#include <api/environment/environment_factory.h>
 #include <api/video_codecs/sdp_video_format.h>
 #include <media/base/codec.h>
 #include <media/base/media_constants.h>
@@ -110,7 +110,7 @@ std::unique_ptr<webrtc::VideoDecoder> SoraVideoDecoderFactory::Create(
 
 SoraVideoDecoderFactoryConfig GetDefaultVideoDecoderFactoryConfig(
     std::shared_ptr<CudaContext> cuda_context,
-    void* jni_env) {
+    void* env) {
   auto config = GetSoftwareOnlyVideoDecoderFactoryConfig();
 
 #if defined(__APPLE__)
@@ -119,10 +119,10 @@ SoraVideoDecoderFactoryConfig GetDefaultVideoDecoderFactoryConfig(
 #endif
 
 #if defined(SORA_CPP_SDK_ANDROID)
-  if (jni_env != nullptr) {
+  if (env != nullptr) {
     config.decoders.insert(config.decoders.begin(),
                            VideoDecoderConfig(CreateAndroidVideoDecoderFactory(
-                               static_cast<JNIEnv*>(jni_env))));
+                               static_cast<JNIEnv*>(env))));
   }
 #endif
 
@@ -251,6 +251,7 @@ SoraVideoDecoderFactoryConfig GetDefaultVideoDecoderFactoryConfig(
 }
 
 SoraVideoDecoderFactoryConfig GetSoftwareOnlyVideoDecoderFactoryConfig() {
+  // SDK の外部から webrtc::Environment を設定したくなるまで、ここで初期化する
   auto env = webrtc::CreateEnvironment();
   SoraVideoDecoderFactoryConfig config;
   config.decoders.push_back(VideoDecoderConfig(